Tons of errors on my site

First off i apologize if i am in the wrong forum. The problem i am having iss the WC3 validator showed many errors on my site, here is the link to all the errors https://validator.w3.org/check?uri=http%3A%2F%2Fgraspingknowledge.com&charset=(detect+automatically)&doctype=Inline&group=0. now hweres the deal i dont know where to look for these problems on my server. if i can find them i can probably fix alot of the errors except the code which i know nothing about.
Your help is very much appreciated
God Bless