Problem with Html error

[Mitch_mooh]

Greetings,friends on Weebly
In order to improve our websites SEO ranking on Google
I used an W3C checker website to see if it's SEO friendly
And bang,I got like 150+ error and 900+ warning about my html and CSS
Result on "W3C Unicorn"

I follow the article I found and trying to find those errors on Weebly html editor,but...
Html editor of Weebly

I saw nothing same as those I saw on W3C Unicorns testing results
Apparently,according to this result,my website got tons of errors

But I can't deal with it(Because I can't even find it)

Since I want to improve its SEO ranking

And I knows (almost) nothing about html
I'll be glad if anyone can help me with it

Thank you

[Adam7]

If you run a site through a checker like that, it's going to point out a whole bunch of code to change because it isn't exactly perfect. You'll see that even if you enter in huge websites that get a lot traffic. I wouldn't worry too much about changing those as they don't have that much of an impact. I would spend more time adding good, unique content to your site and working to get links back to your site from other sources.