I would first ask. Do you really need this in your day to day life? I know a lot of companies use this for hiring, but you can still get a job without them. However if you still want to study them, there are plenty of resources online, like this youtube channel[1]. Taking 2 days to understand insertion sort is fine but you just need to practice learning more often and use the things you learn more often. Even if it's…
He is in college taking an algorithms class, so I would say he does need the knowledge haha.