In my language, there are decent books on the subject and informative and inspiring accounts on Instagram. Look for "baby signing", must be loads of English materials. We created our own extended vocabulary using English baby signing, lots of good words here: https://babysignlanguage.com/dictionary/table/

Like the GP said, helped us loads in communicating with our kid before he could talk, much to our shared delight, and, I believe, relieved a _bunch_ of potential frustration.

We used Baby Signing Time after we discovered our child was deaf at 10 months old:

https://www.signingtime.com/baby-signingtime/

You can find their videos on YouTube too, but we love supporting the organization. When we started signing, everything was unlocked - not just communication, but also creativity, personality, and delayed fine and gross motor skills.