"Proper" technique. I think this is a very important concept to understand in regards to any skill.
But... what does it mean to use proper technique? It usually relies on setting a specific standard, which in itself can be arbitrary.
Proper for what? Proper to have fun without getting hurt is not the same as proper to follow a specific competitive standard. Proper in a controlled environment is not the same as a chaotic environment with unpredictable variables present.

Also, there's the factor of information overload, and many techniques often being presented as right/wrong and black/white. Sometimes it's easy to get caught up in it to a point that hinders your progress.
It's possible to spend too much time thinking about "proper technique" as opposed to actually doing the thing.

I want to propose a very basic standard for proper technique, especially to those who train for fun.
First off, are you doing the thing you intended to do? Second, are you able to do it without pain or risk of injury? If you can do the skill safely, that's already proper.
After that you can layer on additional standards based on aesthetics, power, speed, efficiency, etc. The question to ask then is "How much do I care or want to care?"

Proper form can be many things depending on the context, but my first priority is whether a student can perform some variation of the skill without pain and without risk of immediate or future injury. Of course, everything is dependent on the individual student and their goals.
It's great to have goals and standards, but it can also be good to let go of them sometimes to not get consumed and enjoy the moment.

As always, just something to think about.