When I'm in the middle of something, but have to leave for the day, I will type a bunch of jibberish on the line I was working on (and don't check it in). Then, when I come back the next day, my IDE immediately shows me a highly offensive big red compile error. Fixing the compile error pulls me right back to where I left off.
For longer-term todos, Ilike to use user-friendly task tracking apps that I can access from anywhere (PC and phone). I've used Trello and Asana in the past, but my current favorite is Favro.
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