Need help for modding

[Pathos_IV]

So I have done a lot of stuff with kerbal space program 1 and I want new content 
Please consider the fact that I am new to modding so if your explanation isnt explained like you are talking to a baby I might ask a lot of questions 

I tried to install around 15 mods with curseforge, only two of them worked partially . 
I also installed Kopernicus And Parralax recently but this dosent seem to help 
I am also very interrested by the mod "Outer planets" and I think it would be awesome if only that one could work 

[Pehvbot]

Use CKAN to install and manage mods.  It's not perfect, but it's much better at keeping track of dependency mods, applying updates, and avoiding conflicting mods.  You will want to start with a completely clean install to avoid hidden issues from previously installed mods.

https://github.com/KSP-CKAN/CKAN/releases

[HebaruSan]

This pinned tutorial is pretty much the gold standard: