Read the starting hand descriptions and stick to 0-2 starting hands. Make a few rules of thumbs that are easy to use anywhere for pot odds.

On the flop, 4 outs = roughly 16% pot odds. (4 x 4)

On the turn, 4 outs = roughly 8% pot odds. (4 x 2)

Remember outs times 4 on the flop, outs times 2 on the turn.