Chunking is taking information and separating them in smaller chunks to help memorize things easier. Once you have memorized the smaller chunks when you put it back together, you are going to be able to understand and remember it better. Chunking works fantastic for me. When we were trying to memorize the 25 words, the first set didn't really make sense to me, i would read the words and two second later i would forget them. With chucking i remembered all of them.
Retrieval practice is focusing on getting information out of your brain. For example, you are learning about the industrial revolution, and instead of just reading it and trying to cram you retrieve all the information you know about it from you brain. You are less likely to forget what you are learning with this skill. I personally have used this skill without even knowing what it was, i've been using this skill since i started grade school.
Interleaving is mixing up skills instead of just simply practicing one. I use this skill in tennis practice, my coach never had me practice just one skill. In a day he'll have me practice backhand, forehand, and serving; the next day we would practice volley, slicing, lob, and drop shots. That way i learned the shots better than just practicing one.
Maintenance rehearsal is basically repetition, you repeat things over and over again to memorize them. Although this skill i only use when i don't have to remember things for a long time. I usually use this skill when i have to present in front of class, i repeat the words over and over again until i remember them, but I usually forget what i said at the end of the period.
Elaboration is explaining ideas in details, and it also involves making connections among ideas you are trying to learn. I usually use thing skill in English and history. I don't know why but sometimes what we are leaning in history relates to what we're learning in english. So when i'm reading a story in the english text book, i would go back to history and see what was happening in that time period so i can understand the story better.