I too, keep tips, etc, in notebooks...many notebooks, lol. should have took a pic of those on my cave thread.
When learning how to quilt, and struggling for accuracy, don't be in a hurry. Cut your block as accurately as possible, and make a cardboard unit 1/2" smaller, all the way around, (it is the finished size of the square, etc.), and use this to lightly...I said, lightly, trace onto the back of your piece to use as a seam line.
You have to be careful of using pens, that show thru and hard to get ink out...and graphite pencils, bc the thread picks up the graphite at times.
I use the lead pencils, sometimes, bc the line is so thin, or I use a pen, but go ever so lightly, or a chalk pencil.
It's very encouraging to get accurate blocks, when just learning. :D