Would you be open to suggestions on Scan? You could look through some videos on YT courtesy of KitGuru if you'd like to bring yourself up to speed, though we'd be faster than you going through the videos.
Also, what sort of games would your son want to play and the sort of tasks that he'd like to tax the system with? SSD's do matter, as does a dual channel memory kit as does a good mid range or higher GPU as does a good cooling solution to keep everything cool. What you need is a balanced system.
In this build;
AMD Ryzen 5 5600X Processor; RAM: 16 GB / Storage: 2 TB HDD & 512 GB SSD; Graphics: AMD Radeon RX 6600 XT 8 GB
- Corsair 550 W CV Series CV-550 power supply
^ is the weakest link in the build, sadly.