Dear Webdev,
First of all, excellent site! As a hobby, I wanted to pick up some PHP, and when I am ready, your website will be the first one I visit
I can see that you have already accommodated most of the suggestions made in the previous posts.
This is a fairly minor issue, but I just wanted to point out that Google can be strict about their ad placement. The way it is right now, your site slogan "Learn PHP By Example" directly precedes the Google Ads link unit. It may trick the visitor to click... which Google may not like.
I don't know if it is a big deal, but I have heard sporadic instances when Google cracked down on this sort of thing... (I recall recently, they prohibited placement of graphic/pictures that are aligned with Google Ads, because the visitor may think that the text links are related to the graphic).