Do I need to sign the back of the check?
Endorsement: legal term, which refers to signing a bill, and the rights stipulated in the bill are transferred from the endorser to the endorsee. Generally speaking, after B gets A's transfer check, he stamps the endorsement column of the transfer check, which is endorsement, and makes "entrusted collection" (write "entrusted collection XXXX"), so that B has the right to this check.