If you're a web developer OR python developer, what are the top 3 concepts you should understand like the back of your hand?

MVC architecture!

MVC for backend and how JS works for the front

I always thought MVC is outdated shit, but it helps a lot to think of software modules in 3 main groups. Especially in big projects.

For web, this whole asychronous, promise, callback shit. It makes stuff nicely peformant if used correctly.👌

MVC, isn't that Models, Views, Controllers?

Models being the data tables

Views being whatever the client sees (templates)

Then Controllers, server-side logic (like the views.py file for Django projects)

If it's >insert programming language< developer role, then it's most likely default programming paradigm used in it and framework in the field company works.

Spiders and snakes are dangerous

I'm a python dev, so I know we get it easy when it comes to alot of lower level concepts. How important is say memory allocation?

User first!

The box model!

Programming patterns in general.