hello everyone, greetings

I am trying to open a bank account and also i am trying to get a new driving licences. i have no car. A shop near my apartment want me to work with him. but he say he will only give cash to work and it is per day basis.

i am thinking to join this job because this is near my house and want to be busy until i found another job. please suggest me if it is good idea or not working in cash .
what is the bad point of working in cash or i need to stay ideal for some time and wait until i find another job . i am very new to usa.

thank you
prakash