1. Nothing lasts forever and you always need to be prepared for change.

That might be technology acquired by other company and dropped completely by all of people or new technology take over the market for a year and is gone after that and no one remember about it.

2. If you go opposite way then all of people around you that might be actually the best way.

That learned me to always look around for new stuff cause this small stuff that people make today can be big company next day just cause they got annoyed by things and start something new.

3. Trust nothing that you see.

Bugs are everywhere

4. Quality and speed doesn’t matter when you start doing something but consistency matters a lot.

When you start doing something you suck and you need to be ok with fact that you’re going to make lots of stupid mistakes and learn from them.
When you start new prototype you don’t need dozen tools to finish it, you don’t need performance or perfection, you need consistency to finish it.

Good luck