Some of that's fine. A lot of information and daily encounters aren't important to hang on to in the long term. But for the stuff you do want to remember in work and in life, there are several ways to train your brain to hold on to what you want.
Use a memory trick. I've found sorting facts and information into a song or mnemonic device is helpful. According to neuroscientists, humans can only hold about three or four pieces of information in our minds at once, so they suggest you try to cheat that limit by sorting the information into chunks.
Focus on what you want to remember. Hopefully, you know the pitfalls of multitasking. (You're more likely to make mistakes, it will take longer to complete tasks, and you won't retain much of what you did.) So, it makes sense that one of the best ways to remember things is to focus.
[
add
]
[
|
|
...
]