What I find helpful when teaching a new concept to a student, and it is something I really want them to remember, come up with a silly saying or chant to help out. For example when teaching a student that when you are multiplying two negative integers together the product is always a positive integer. I have my students learn this little chant, negative times negative, equals, papositive positive. Every time I say, "class what happens when I multiply two negative numbers?" they chant back "negative times negative, equals papositive positive." Sometimes just doing silly little tricks like that keep something new, fresh in your head!