system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU] How come Dr Strange has to learn how to use the time stone from a book whereas Thanos can adeptly use each infinity stone the second he gets it?
gpt
Thanos has been on this quest for decades, evidence that he already knows what they are. Chances are he's done his research.

Strange is new to magic and sorcery when we meet him.  Everything is new to him and he's just learning.