The easiest way is probably to use the Curseforge app (I recommend the standalone option). Install it, then on the left side click on "Add a game" and add Minecraft. Once that's done, you'll be able to browse for mods and modpacks within the curseforge app and automatically install them. After installing a modpack, press launch, then a minecraft launcher window will appear prompting you to login. Insert your minecraft credentials and press play! More on reddit.com

FTB Infinity Evolved More on reddit.com

There are 2 Mod loaders available for Minecraft Java. These are Forge and Fabric. Both of their downloading processes are the same, so don't worry. First, make sure you made an instance of the version you'd like to download. Just simply make a minecraft instance and run it 'till the start screen. If you already made one before (because of playing in that version) then there's no need Second, choose between the two what mod loader you'd like. After that, go to their respective website toget the downloader. Simply search for "forge/fabric downloader" and you'll get led to the website. Thirdly, execute the file and follow instructions. Once you done that, you installed the mod loader. Fourth, search for mods in curseforge.com. Make sure the mods have a specific mod loader version or it won't work. Note: Fabric requires a mod named "Fabric API". Don't forget to download that if you're using it. Fifth, after downloading the mods, go to uour file explorer and to %appdata% \ .minecraft folder. Find the mods folder and put it there. If there's no folder named "mods" create yourself one. And there, you just downloaded mods. Lots to digest but easy to understand. Also, I don't know about modpack so I'm sorry that I can't help you there. You need to be a bit technical there. More on reddit.com

I didn't know Curseforge as a "hidden gem" feature, how does one find modpacks with that award? More on reddit.com