It's important to know how to talk to yourself. I send myself email messages about all sorts of things I'll eventually want to remember. I send them to my gmail email account, because Google will (probably) keep my email easy to search for just about forever.
The tricky part is, where do I send these reminders FROM? If you play chess, and you like what's called a "perfect mate", you'll understand that I don't want the duplication involved in mailing FROM my Google gmail account TO my Google gmail account. So it follows, as night follows day and day night, that I must keep ANOTHER email account simply for the purpose of emailing to myself. Works for me! (see the end of this Morphy game for an explanation of Perfect Mate.)