Even if you are going to do something straightaway, if it has several steps, write down what you are going to do (especially if there is a chance one of the steps might distract you).
If something has to be moved somewhere else and you are not going to do it straightaway, at least move it part way so that it will remind you next time you pass it.
Don’t ever assume you will remember something (however important / significant it might be). Everything you are not going to do straightaway should be written down, straightaway.
Make lists, make them in advance of needing them, modify them as errors and omissions are detected. Make a list of your lists (and how / where to find them).
I have a one-page yearly diary, a weekly planner and an online calendar on my phone. My Google Home Mini puts the calendar information onto my phone. These all replace my memory. If It’s [...]