Definition: ASL stands for American Sign Language used by culturally Deaf people in North America.
Also "Ameslan" (old term in the 1960s); Aslian (as in ASLian). They can refer to not only the language but also (Deaf) culture and people.
First 100 words.
As you feel more comfortable with the first few hundreds of ASL signs, progress further with your vocabulary and learn signing more.