Webmaster need help on Google crawl errors

Hello internet users,

It is with utmost humility that i write this post to seek for help from webmasters and internet users on how i can fix Google crawl errors on my site.

I have close to 800 crawl errors as i write this post and it has resulted in my site not showing in google search results again, i have read alot on the crawl errors and i find some of the advice useful, and i could not comprehend some. 

I will appreciate it if any one can give me clear instructions on how to go about all the types of crawl errors one can encounter. 

Please make it as simple as possible and give case study and how you go about it.

Please share this information with friends on twitter, they might be able to help.

Thank you all.