I don't know how to use a modpack in my game example:https://www.curseforge.com/minecraft/modpacks/rlcraft
that one i tried to put it in mods section but it doesn't work?
download twitch and use it from there - DOWNLOAD --> https://www.twitch.tv/downloads
after you download it create an account, when you are done go to the top of the screen on the twitch app,
and where it says "Mods" click on it go on minecraft - install minecraft: and then login to your account, the last thing
you need to do is go to "Browse Modpacks" and select what type of modpack you want to be installed for example, RLCraft type any modpack in
and then when it is ready then do "play" boom you are in the game and can play now, hope this comment helped you!