I have zero understanding why its not something that governments can provide through an online pre-recorded trainings, why is it so difficult to learn deaf sign languages to the point of most known practical way to do it is by getting a minor degree in it (most usually in education)? If anyone wondering which sign language, I’m interested in learning more than one if I find a feasible way to learn them so: American Sign Language/Black American Sign Language (dialect - both are used in the US and Canada), Brazilian Sign Language, British Sign Language, Catalan Sign Language, French Sign Language, Inuit Sign Language, Quebec Sign Language, Swedish Sign Language
One other somewhat bizarre option is that I’ve heard there is a large deaf community in VR Chat and they actually have a modified sign language that they use.
I don’t know exactly how “modified” it is, but for learning any language the best way is to find people to talk with. Might work as a good springboard if you have VR.