I say this all the time, but never be afraid to mark the right side/outside/public side of your work. It's soooo easy to get it flipped around when you lay it down, or absentmindedly go the wrong way in the middle of a row. Nearly everyone does it, and it's especially likely when you're just starting and the pattern isn't obvious yet.
Use a safety pin, a scrap of yarn, a paper clip, anything you have. I have no idea why some knitting instructors try to say using right-side markers "isn't professional." I'm a confirmed amateur, because after forty-two years I'm still using right-side markers and don't intend to stop.
Also, when you get to decrease rows and such, when you have to put your work down, write a note to yourself: "Last finished row was 16" or whatever applies. If you have something going and know you'll have to put it away for a while, either bag it with the pattern or tag it with a note that tells you what the pattern is and where to find it ("Blue Hat pattern on my iPad, row 17 finished.")