Hello Rabbi/Rav, May I think about work on Shabbat? Best

ב"ה Shalom This is the first of your many questions which you sent this time around, which I will answer gladly as well as your other questions. However, a person who has questions at this level, should acquire some basic books of Jewish law for self-learning , or go to some basic lessons of Jewish law so you begin to satisfy your quest for this knowledge and so that you begin to familiarize yourself with some basics of Jewish law. Now, to your actual question. The Shulchan Aruch (Orach Chaim 306: 9) states that one may ponder about their work on Shabbat . However, because of the mitzva to be in state of pleasure on Shabbat, it is preferable that one should not ponder about work at all, and should see all his work as done. All the best