Over 70 million people around the world use sign language as their first language. Not all of those people have hearing impairments. I use sign language while using vocal communication when talking to some individuals who have special needs. This supports communication giving people who may be non verbal a way to communicate.
I've found that sources online for learning signs can be boring to look at. I think encouraging people to learn basic signs and the alphabet starts with interesting and appealing visuals.
ASL(American Sign Language) BSL(British Sign Language)