Getting productive with automated tests

I want to talk about when to test or not to test, what type of test should you be focusing on depending on your application
the main idea is to be a follow up for intro-automated-tests
what type of test has the best cost benefit for your situation?
“to test or not to test”
- https://x.com/ThePrimeagen/status/1792975339825619363
- https://x.com/ThePrimeagen/status/1622303362325651457
how to move faster and safer (conclusion using the test the right way)