The comma after words needs to be complemented by one before in because in other words is an integral phrase interrupting the rest of the sentence.

Answer from Barrie England on Stack Exchange
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Wheaton College
wheaton.edu › academics › services › writing-center › writing-resources › the-comma
The Comma - Wheaton College, IL
Modifiers that reference the same word need commas separating them if there are two or more and if you could sensibly put the word “and” between them. It’s a tall, impressive building. The unusual, heavy box was strangely shaped. When there is a direct speaker, use a comma to introduce direct quotations. A colon is used for other kinds of quotations and citations. However, a quotation can also be its own sentence or be directly integrated into a sentence. The angry girl shouted at her younger brother, “Stay out of my room!” · After the day and, in a sentence, the year: On November 27, 1975, my big brother was born.
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Brandeis University
brandeis.edu › writing-program › resources › students › academic › style-grammar › comma-rules.html
Comma Rules | Style and Grammar | Academic Writing | Writing Resources | Brandeis University
Use a pair of commas in the middle of a sentence to set off clauses, phrases, and words that are not essential to the meaning of the sentence. Use one comma before to indicate the beginning of the pause and one at the end to indicate the end of the pause. Example: Hilda, a very good cook, went to San Francisco. Do not use commas to set off essential elements of the sentence, such as clauses beginning with that (relative clauses). That clauses after nouns are always essential.
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Purdue OWL
owl.purdue.edu › owl › general_writing › punctuation › commas › extended_rules_for_commas.html
Extended Rules for Commas - Purdue OWL® - Purdue University
The food, on the other hand, is rather bland. Word: I appreciate your hard work. In this case, however, you seem to have over-exerted yourself. 4. Do not use commas to set off essential elements of the sentence, such as clauses beginning with that (relative clauses). That clauses after nouns are ...
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Pristine Word
pristineword.com › comma-in-other-words
Commas Before and After 'In other words'
June 4, 2022 - "In other words" should be surrounded by commas in the middle of a sentence. Add a comma after "in other words" to introduce a new sentence that repeats what has been said in a different way.
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Style Manual
stylemanual.gov.au › grammar-punctuation-and-conventions › punctuation › commas
Commas | Style Manual
You don’t need a comma after an introductory word if the sentence is very short. This minimises punctuation in very short sentences. Today I went to work. Use commas after adverbial phrases and adverbial clauses. Adverbs – such as ‘first’ and ‘during’ – modify verbs, adjectives and other ...
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IUP
iup.edu › writingcenter › files › writing_resources › punctuation › commas.pdf pdf
Commas
Use a comma after certain words that introduce a sentence, such as well, yes, why, hello, hey, etc. Example: Why, I can't believe this! Example: No, you can't have a dollar. Rule 4b. Use commas to set off expressions that interrupt the sentence flow (nevertheless, after all, by the way, on ...
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Antioch University
antioch.edu › wp-content › uploads › 2017 › 02 › VWC-Comma-Usage.pdf pdf
ANTIOCH UNIVERSITY VIRTIUAL WRITING CENTER COMMA USAGE
Transitional words and phrases are often used to show the logical ... Use a comma to separate information. Locations: I was born in Mexico City, Mexico. Dates: This year, Independence Day will be on Wednesday, July 4th. (Note comma after “this year” (introductory phrase).
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Scribbr
scribbr.com › home › comma before or after and | rules & examples
Comma Before or After And | Rules & Examples
March 20, 2023 - Examples: “And” connecting two short independent clausesJanice speaks and Justine listens. Janice speaks, and Justine listens. Use the best grammar checker available to check your comma placement quickly and easily. ... As a conjunction, “and” can also connect all kinds of different words: adjectives, verbs, nouns, and so on.
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The Writing Center
writingcenter.unc.edu › home › tips & tools › commas
Commas – The Writing Center
May 14, 2024 - To fix these comma splices, you can do one of four simple things: just add FANBOYS, change the comma to a semicolon, make each clause a separate sentence, or add a subordinator (a word like because, while, although, if, when, since, etc.)
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University of Maryland, Baltimore
umaryland.edu › media › umb › oaa › campus-life › writing-center › documents › Commas.pdf pdf
Oxford comma - Writing Center
Use a comma to highlight the contrast in short elements at the end of a sentence. Example: The bike belongs to my brother, not you. ... Use a comma to separate what is being said from who said it. If used before a quotation, the comma should go ... If used at the end of a quotation, the comma should go after the last word of the quote but before the end
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Grammarly
grammarly.com › blog › comma
Rules for Using Commas, With Examples | Grammarly
July 1, 2023 - As a rule of thumb, if the phrase is longer than about four words, use a comma. You can also use a comma after a shorter phrase when you want to emphasize it or add a pause for literary effect.
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The Punctuation Guide
thepunctuationguide.com › comma.html
Comma | The Punctuation Guide
In this usage, the comma separates a series of words, phrases, or independent clauses. Do not place a comma after the last item in the list (see fourth example below) unless the structure of the sentence otherwise requires it (see third example below, in which the comma after audience is required to separate an introductory dependent clause from the main clause).
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Reddit
reddit.com › r/grammar › hi. first time here. when do we use a comma after is?
r/grammar on Reddit: Hi. First time here. When do we use a comma after is?
February 17, 2021 -

I usually use a comma after is in a sentence "The biggest thing he does is, that he produces candles"

Is that correct?

Top answer
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Short answer: no. Your best option is to cut this sentence down. A better way to phrase this sentence: "The biggest thing he does is produce candles." The instinct to throw a comma after "is" comes from conversational English, which somehow has given way to absurdities like "What he is is a man." My suspicion is this repetition makes sense in our mind, but on paper and out the mouth feels awkward, so we put a comma in between each "is." This eventually leads to sentences like your example. A good rule of thumb: always try cutting and/or rephrasing. For, like, everything.
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You should almost never use a comma after 'is'. Commas are like parentheses: in a nutshell, they cut off one part from the rest of the sentence to improve the flow of how it gets read. In slightly more detail, there are essentially 6 main uses of the comma, as follows. See Grammarbook (NB: some of their rules overlap and could potentially be better phrased). Separating lists of things. Commas separate out sequences of three or more words or phrases that act together as a single subject or complement within the clause. e.g., "My estate goes to my husband, son, daughter-in-law, and nephew." 2. Separating lists of adjectives. Commas separate two adjectives both modifying the same word or phrase. e.g., "He is a strong, healthy man." 3. Separating two connected ideas. Commas separate two independent clauses with a conjunction between them. e.g., "He walked all the way home, and he shut the door." 4. Separating reasons that come before their results. Commas separate dependent clauses or introductory phrases that precede their main clause. e.g., "If you are not sure about this, let me know now." 5. Separating nonessential words or phrases that interrupt the rest of the sentence. e.g., "Jill, who is my sister, shut the door." 6. Separating interjections from the rest of the sentence. e.g., "Why, I can't believe this!" (Bear in mind that there are a few pitfalls with these rules due to exceptions that I've left out.) So unless you are interrupting your sentence (e.g., "The thing he does is, for some reason, produce candles") you're unlikely to need a comma. Also, commas are more often than not superfluous. So, if in doubt, leave it out.
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ProWritingAid
prowritingaid.com › Comma
Comma - The Grammar Guide
For participial phrases in the middle of the sentence, the phrase requires commas both before and after it. For participial phrases after the main clause, put a comma before the participial phrase. Sometimes when writing we omit words for stylistic reasons.
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Yuba College
yc.yccd.edu › wp-content › uploads › 2019 › 03 › CommaRulesBasicsAccessibleMarch2019.pdf pdf
Comma Rule Essentials: before, after, around, between
Place a comma AFTER an introductory word, phrase, or clause. Introductory words include mild interjections, words of · direct address, and signal words like however and first. Introductory phrases include longer prepositional phrases and ... Oh, I don’t think that’s necessary.
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Mots Justes
motsjustes.wordpress.com › 2009 › 08 › 25 › tuesday-afternoon-punctuation-commas-part-xi—in-other-words
Tuesday Afternoon Punctuation: Commas, Part XI—In Other Words | Mots Justes
August 28, 2009 - Meanwhile, I have my own projects (in other words, my blog). One exception to this guideline is the use of or to mean “in other words.” In this case, or should be preceded by a comma but not followed by ...
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GCFGlobal
edu.gcfglobal.org › en › grammar › commas › 1
Grammar: Commas
You should also use commas to separate nonessential clauses that appear in the middle of a sentence. A nonessential clause is something that adds meaning but that isn't completely necessary. In other words, if you took it out the sentence would still mean basically the same thing.
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Linguablog
linguaholic.com › linguablog › comma-after-and
Comma after "and": The Definitive Guide
April 11, 2023 - The simple truth is that you never need a comma after “and” because of the word “and” itself. In other words, unless there is some other grammatical reason that a comma needs to appear at that point in the sentence, the word “and” shouldn’t be followed by one.