"Get" as "obtain":
* "Get" something: You would sign the object first, then sign "GET" which is a "C" handshape moving from your chest outwards.
* "Get" a job: You would sign "JOB" and then "GET".
* "Get" permission: You would sign "PERMISSION" then "GET".
"Get" as "move to":
* "Get in the car": You would sign "CAR" then "GET" using a "5" handshape moving towards your chest.
* "Get on the bus": You would sign "BUS" then "GET" using a "5" handshape moving towards your chest.
"Get" as "become":
* "Get better": You would sign "BETTER" then "GET" with a "B" handshape moving upwards.
* "Get sick": You would sign "SICK" then "GET" with a "B" handshape moving upwards.
"Get" as "understand":
* "Get it": You would sign "UNDERSTAND" then "GET" with a "Y" handshape moving from your forehead outwards.
It's important to remember that signing is about context and understanding the nuances of the language. The best way to learn ASL is to take classes from a qualified instructor.