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Do you leave reminders when you have to stop playing?
(files.catbox.moe)
Had to stop for IRL reasons. Was about to build a coal depot but I knew that saving at a blank screen would be confusing.
That's one way!
You can also add map markers to your map, with an icon and text. I've used these to set goals / reminders of what should be worked on in that area.
My general method to remember what I need to do next session is to name my saves that way. Like "start coal depot.sav", or "finish steel, fr this time, no distractions.sav".