Synonyms are objects that refer to other objects. For example, they can point to a table. The underlying table does not have to exist at synonym creation time. The syntax is CREATE SYNONYM and then the synonym name, and then FOR plus the name of the object you are referring to.
Dynamic SQL is SQL that is stored in a string and executed from it. You run the SQL using the EXEC command, passing the SQL in parentheses. You can build up the string in code. Just got to be careful if the string is built from inputs that might be unexpected. Worst case, a malicious actor could inject some nasty SQL into your string which you execute.
