W3C Validation Errors . Need your help .

Hi all !

I just started my first blog and want to try on it all I have read (and continue reading on BHW) . I'm using Newspaper theme , which I like very

much but when I checked my blog with W3C it showed me 19 errors : Element div not allowed as child of element span in this context. (Suppressing further errors from this subtree) .

I do not understand how to fix them . Do I need to find and delete this lines ? I tried to find solution of this on google but it little bit hard to understand how do fix .
Also I would really appreciate , if you check my blog and advise me what to change ).

Thank you for any help .

W3C validation is good but I've found it's next to impossible to get 100% clean score in real life.

What I do as well as the validation is load the site in Chrome, Firefox, IE (it will be Edge when I migrate to Windows 10), Safari (PC version) and if I want the site to display nicely on a mobile I'll check it on my Android and a friend's iPhone.

If it looks the same on all the major PC browsers - as close to a pixel perfect match as possible - and doesn't break on a phone, it's good to go.

If buttons and other things render differently on, say, Chrome and Firefox then it needs sorting out.