Can you recommend some daily brain exercises to improve short-term and long-term memory?

Meditation
Meditating is a beneficial activity that engages both body and mind and helps you to concentrate.
Visualization
Visualization is a mental process in which a mental image forms to communicate a message or information. The more you visualize, the more you improve your short and long-term memory.
Game playing
Playing different games such as card games not only cheers you up but also affects your brain. Researches have shown that there is less possibility of cognitive disability in seniors who plays the game regularly.
Memory card games
Memory card games are one of the best games that improve your short-term memory. They test your short-term memory to see whether you remember the pattern or not. Therefore, you exercise your brain and have fun at the same time.
Crossword puzzles
Crossword puzzles are fun and beneficial games. Forgetfulness and memory declination will delay if seniors play crossword puzzles regularly.
Jigsaw puzzles
Jigsaw puzzles are tilling puzzles that require you to assemble different and oddly shaped pieces of the puzzle. Therefore, they will help you to perceive the concept of mental rotation. They also delay the mind’s ageing.
Sudoku
Games such as Sudoku challenge your brain a lot. If you want to have fun and at the same time improve your short and long-term memory, Sudoku games are among the best memory games.