I getting an error on both mod creating tutorials

[TheImmortalDRACY]

So I tried the baby first mod after I gave up doing the normal one when getting 3 errors and For the record, I installed git, installed visual studio community with .Net desktop development. and I'm pretty sure .netstandard2.0 I couldn't find it anywhere so I downloaded the .Net SDK 2.0 and 5.0 after I tried .Net SDK 2.0 and I used the setup file got everything done and when I press build solution I get 35 errors. I'll send a picture I could use some help.

Update I fixed most of it and now I have 3 errors