I heard you wanna install mods. This will help you. Soon I will do a Module Manager tutorial, but CKAN in my opinion a very easy easy way to install mods.
Steps: First, you wanna go to this link, and follow my instructions. https://github.com/KSP-CKAN/CKAN/releases/tag/v1.29.2 This will take you to something where you will see "Freedman" or something like that. Scroll all the way to the bottom. (This is mainly for windows sorry mac bros) Now, click on ckan.exe. Let it download, and then open it, it should be at the bottom like most .exe downloads are. Now, it might say like it was blocked from Windows Security, if it was, this may be the end, because you might have to change some settings with Windows Defender. Do not do this if you think it will harm your computer. Now, when you open it, it may show like a "Run" option, click Run. It may update repositories when it opens, just wait. Now, you should see a list of mods and then some other things, the only thing you need to really use is Refresh, Apply Changes, and the list of mods. Now, say you want to refresh the list, click refresh. If you want to install a mod(s), click the check box and click Apply Changes. You might wanna make sure the version of the mod is up-to-date, and you might need Module Manager for some, which I will do a tutorial of soon. If you had any problems, let me know and I will help you out.]xc