So, I apologize if this is the wrong forum. As you can tell, I'm new to the forums. Anyways, I saw an experienced YouTuber's mod videos and I asked him how he avoided having to redo his mod folder due to updates. He replied with telling me that he does a separate installation. I've researched this for around an hour and I've found barely anything useful. I was hoping that someone can tell me the steps in the comments? (When doing this, please try to explain this simply. I found one post on steam about it and I was unable to do it due to some things not being clear enough and me not being able to understand what was said.)

Thanks!

There are some tips here related to what you describe.