Heather provided an excellent answer, so the only thing I would add to her response to answer your question is the following:
1. In addition to learning the meaning of each expression, try to come up with different sentences/scenarios that would help you remember each one. The more these sentences/scenarios resemble real-life situations, the easier it will become for you to remember them. Recruit a friend/classmate to quiz you on each one and try to come up with ways that applicable to your life.
As you go about your regular day activities, take advantage of situations that remind you of each of these expressions and say them out loud. Also, write them out on a notebook (or on your phone). The more senses you engage, the easier it will be to remember them.