How do I teach my baby No?

We haven't had a huge amount of issues with this yet. But when she did a phase of pulling hair and finding it funny, i slightly pulled hers - not enough to hurt her but enough for her to know. I said did that hurt? She said yeah, so i said shall we stop pulling hair then? And she said yeah and never did again.
She has bitten me once yesterday and once the day before and have tried telling her no and explaining. Both times were when she was excitedly playing so I don't want to be too harsh yet, but if this is a new thing I will do the same as before.

At this age they don't understand no and it's like a red rag to a bull.

Change the approach. Tell her what she can do not what she can't. Instead of we don't XYZ where all she hears is XYZ so carries on tell her we use kind hands and show her.

If she does it again step away (stay close still). Don't give a big reaction to it or loads of attention as she'll carry on doing it.

I grab her hands and tell her we dont do that. We hug or high five or pet mamas hair. So far it has been working. Thats also how I got her to stop hitting the cats and now she runs to hug them. Shes 15 months

My 13 month old understands no. I use a firm voice, and tell her know. Primarily when she is trying to play with the cat, when the cat is sleeping. If she does other naughty things, she also understands the word no. You have to be consistent in how you say it. Move them away/put them down etc.

My 15 month old has starting biting & he understands no but finds it hilarious!!

Take away the object and/or redirect the action. For example if it’s hair pulling, remove hand from the hair while saying “No, let’s play with X instead.” As they get older they’ll be better able to understand the why “we don’t pull mummy’s hair because that hurts” but to start just redirect the behaviour into something they can do, rather than something they can’t do.

My daughter went through pulling my hair so hard !! 😢😢😢 and hitting our faces, we would say “no” (looking in her eyes) and put her down and walk away to do another task, I must say it has cut down ALOT! Get it the odd here and there but usually when excited so I know it’s not intentional like before.

When I was saying just “no” and “kind hands” (showing her) she didn’t understand and found it funny, I think removing myself she realised, mum doesn’t like this and has walked away- hope this helps !

I would tell her no and physically move her away from what she was doing, this seemed to help