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After completing the required courses you may start learning a great track that I didn't mentioned in the list above, and that is a track dedicated to API.
This portal contains videos on YouTube and the site is completely free. Unless you want to download the video series. If you like the content then you may donate. The site is an excellent platform for learning PHP, MySQL, CodeIgniter (PHP framework), CSS. The best part is that maximum videos are of short duration.
NOTE- If you have good amount of time then you can learn a lot, though this is also true that you may still need to struggle also non of these are as good as paid course but still if you compare the price then these are best. So, don't compare these with paid courses and classes.