Should I try to memorize all CSS details or should I just focus on the important things?

Answer 1

you Know Pratice Make Man Perfect
I asked same question when i was begginer and senior one gave this answer
so you don't need to memorize all Css details keep praticing automatically its set to your mind without knowing^_^

Answer 2

memorizing is good but more importantly practice. The things you use most often will become important to you and you can gradually add additional features depending on your skills and level of knowledge.