This actually isn‘t philosophical advice, but psychological one. As a teacher i use this concept and it definitely helps alot. Instead of saying „good job“ you take one or two specific things and compliment them. This is actual valuable feedback which will help people of all ages understand what exactly they did well. The same obviously goes for criticism, if you are specific people can actually learn. They will appreciate it.

I do agree it‘s „basic“, but many people don‘t know this so i don‘t see any harm in sharing it here.