You can generally use for the backend whatever language you want, it should only already have an http(s) server library and some for database access; plus points for a ORM. So yes, you can perfectly fine use java, and it's actually quite well used; see Spring or the more modern Quarkus . You'll only dont see it in much guides bc Java is industry standard, and as such, cannot evolve as quickly as other things and therefore arent "fancy" enough for SEO. But the big plus is it's enormously reliable. So If your only choices are java or python, I would rather choose java, since you also can do any non-fullstack development job once you know java. To be fair, in the data sience field, python is clearly the winner with libraries like numpy. But thats only the backend. For the frontend part of the fullstack development career you unfortunaetly need to learn javascript or typescript (which is essentially just javascript with types, but you'll definitevly want to use it for big projects instead of javascript as it helps you to avaoid some major pitfalls). Edit: Also please learn HTML and CSS like @KaneDarks suggests; it will help a LOT not only in job oportunities when you can show you even understand the underlaying parts of all frontend frameworks but also helps you greatly in actually building awesome and great products. I only don't quite understand what you mean with "what is it pls do tell me"; do you ask for what java is or for something entirely else? More on reddit.com

I said it then I am saying it now again and again and again: the best way to learn a stack is projects. No YouTube, no courses, pick some ready made Database, connected it to a back end, figure out how to ORM, apply MVC, make apis and then secure the api. Rinse and repeat to all modern stack development. If you want to know how to deal with multiple requests, study load-balancing, if you want to integrate them separately yet together, figure out microservices then use some sort of service discovery. Think up from design and you will learn design. More on reddit.com

Please ensure that: Your code is properly formatted as code block - see the sidebar (About on mobile) for instructions You include any and all error messages in full You ask clear questions You demonstrate effort in solving your question/problem - plain posting your assignments is forbidden (and such posts will be removed) as is asking for or giving solutions. Trying to solve problems on your own is a very important skill. Also, see Learn to help yourself in the sidebar If any of the above points is not met, your post can and will be removed without further warning. Code is to be formatted as code block (old reddit: empty line before the code, each code line indented by 4 spaces, new reddit: https://i.imgur.com/EJ7tqek.png ) or linked via an external code hoster, like pastebin.com, github gist, github, bitbucket, gitlab, etc. Please, do not use triple backticks (```) as they will only render properly on new reddit, not on old reddit. Code blocks look like this: public class HelloWorld { public static void main(String[] args) { System.out.println("Hello World!"); } } You do not need to repost unless your post has been removed by a moderator. Just use the edit function of reddit to make sure your post complies with the above. If your post has remained in violation of these rules for a prolonged period of time (at least an hour), a moderator may remove it at their discretion. In this case, they will comment with an explanation on why it has been removed, and you will be required to resubmit the entire post following the proper procedures. To potential helpers Please, do not help if any of the above points are not met, rather report the post. We are trying to improve the quality of posts here. In helping people who can't be bothered to comply with the above points, you are doing the community a disservice. I am a bot, and this action was performed automatically. Please contact the moderators of this subreddit if you have any questions or concerns. More on reddit.com

Understand the Backend Basics Learn the fundamentals of how the backend interacts with the frontend, databases, and APIs. Start with Java: Brush up on Java basics: OOP concepts, collections, streams, and exception handling. Resources: YT Channel: “CodeWithHarry” or “Telusko” for Java beginners. Course: "Java Programming Masterclass" by Tim Buchalka (Udemy). Move to Spring Boot: Learn how to create REST APIs, dependency injection, and security basics with Spring Boot. Resources: YT Playlist: “Java Brains – Spring Boot Tutorial.” Course: "Spring & Hibernate for Beginners" by Chad Darby (Udemy). Database Knowledge (Postgres): Learn SQL basics: Joins, CRUD operations, indexing, and querying. Resources: YT Channel: “The Net Ninja – SQL Tutorials.” Blog: Postgres Official Documentation or tutorials on GeeksforGeeks. Work with AWS: Start with services like EC2, S3, and RDS. Learn deployment basics. Resources: YT Channel: “TechWorld with Nana.” Course: "AWS Certified Developer Associate" by Stephane Maarek (Udemy). More on reddit.com