I recently started using Anki on my phone. Seems easy, effective and even somewhat fun. I don't actually have anything that seems very important to memorize yet though. I've been (re-)learning Hiragana and Katakana with the vague intention of learning enough Japanese to read untranslated manga or something, but while it's been easy enough so far the goal doesn't seem super high value and Kanji is looking many times harder.
What do you do for a living? I'm sure there's something there that'd be worth memorizing.
How good are you with names & faces? Birthdays? Telephone numbers?
Another thing I use it for is learning new vocabulary. Maybe once or twice a week I'll run across a word in an article that I would typically jump over & just assume I know what it means based on the context, sometimes when I look it up I'm surprised. The other benefit is that memorized words will be more available to you when writing or speaking.
This is the public group instrumental rationality diary for July 1-15.
Thanks to cata for starting the Group Rationality Diary posts, and to commenters for participating!
Next diary -- July 15-31
Immediate past diary -- June 1-30
Rationality Diaries archive