When you are following a knitting pattern it is sometimes easy to get lost.
You can prop your pattern up beside you on a recipe book stand.
And mark where you are exactly with a post-it note.
If you leave your knitting for a long time, leave it on a stitch holder not your needles.
If the pattern is from a book or magazine, make a working copy. It’ll be easier to travel with and you can make notes on it of any modifications you’re making.
I always make a copy of my work so that I can easily count rows and stitches with little tick marks in the margins… it works most of the time. When I have to leave my work and I know it will be a while, I pencil in where I left off because my memory is nearly non-existent.
There is an entire sticky thread at the top of the forum devoted to knitting tips. 