Welcome to the Quilting Board!
I have a t-gauge that is my favorite thing to use. Before I got it, I would use Post-it notes...tear off about 3 or 4...stays in place pretty good and no residue whatsoever. I have had residue with painter's tape...but to get around that when I used it I would stick to my jeans and peel away two or three times. That took care of it being overly sticky.
Great idea if you have a dark enough sewing bed. I use blue painter's tape due to eye condition that makes it hard to see white on white and black on black.
Command strips work GREAT!