My cousin bought some little stickers with frowny faces, and some stickers with cute animals on them, and put them on various things in the house.
If her little girl touched a frowny sticker she got a very firm, "NO, NO!," a little slap on the hand, and was shown the sticker while being told, "Frown faces are no nos!"
If she saw her touching a smile sticker she would praise her, hug her, etc., and sometimes reward her.
A lot of people accused her of treating her daughter like a trained dog, but - - - it worked.
Amy stopped touching anything with a frown on it, and even would run around playing games like she was PRETENDING to touch a frown, then shout, "No no," and run over to an animal to touch it and see what kind of "reward" she got.
And you really, really need to baby proof things. The electrical outlit covers, the cabinet and drawer latches, ... they can save a child's life, and a mother's sanity.