There are variants of HELLO in different contexts. See a few examples below.
Meaning: Used as a greeting or to begin a telephone conversation.
Meaning: HELLO EVERYONE (or ALL OF YOU). [Video contributed by Greg Eyben, 2016.]
Meaning: HELLO in a plural form. [Video contributed by LaDonna Snyder, 2017.]
It can be used as another variant for "HELLO EVERYONE" in some contexts or as a big greeting "MANY or BIG HELLOs!" in other contexts.
How do you say farewell? GOODBYE.
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.