It's too broad a question to give a definitive answer to. It depends on the context. If you want to generalize, follow the 80/20 rule - 20% of the effort resu

It's too broad a question to give a definitive answer to. It depends on the context. If you want to generalize, follow the 80/20 rule - 20% of the effort results in 80% of the benefit. Think like a business owner. Identify what the one or two key metrics are and come up with ways to efficiently ship ideas to test to improve them. Write code that is easy to test. Add high value tests. Avoid perfectionism.