Just something to keep in mind (as it’s been a while since I’ve looked at Alex’s course) it’s quite good but some of the information may be out of date. I’m not sure if he is retroactively applying updates to the course. If you have any questions please do let us know and we can clarify any mixed information.
That being said, he course is really good and gives you a good look at Strapi, especially when it comes to customization. 