By definition, mnemonic devices are memory aids. They may be something verbal such as a very short poem or a special word used to help a person remember something. They could be visual, kinesthetic or auditory. They use associations between easy-to-remember constructs and the thing to be remembered. This is based on the principle that the human mind much more easily remembers something spatial, personal, surprising, or humorous as opposed to meaningless sequences.
To the right you will find a number of mnemonic devices people use to remember things.
Practical tricks for improving your memory.
Tips for improving you memory. Get enough sleep, exercise more, avoid processed foods, eat the right fats, ... . Explained scientifically and simply.
If you ignore the yoga part, this is great advice on how to improve your memory. (Use meditating on the Word instead of yoga.)