404 error problem in google webmaster tool

Hi sir. I made my site 2 months ago. I posted a lot of things 20 or 30 posts after that I deleted all the post from my WordPress site and started again.

Now, in my google webmaster tool, I’m facing 404 errors. I want to resolve this error.
https://imageshack.us/a/img829/2561/osgk.png
Here is the image of my google webmaster tool. You can see 211 Not found errors and 2 Soft 404 Errors.

Please tell me how can I resolve these errors and how can I delete the previous indexed links which are present on google, but not on my website.