Okay so it becomes a matter of opinion as to how significant an improvement it makes. In my field as a piano teacher it‘s essential. For others it isn‘t. Although everyone teaches something to others in their lives…

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.

What‘s your definition of an LPT? To me it just needs to be a tip that can be valuable for my life in some way.

If you are a better friend to people they will make an effort to be better friends to you or be less likely to abandon you in the long run. Being a pleasant human does benefit you.