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aside from the amssymb problem is there any other issues with my code that is producing the other errors or is it all because of the misuse of the amssymb package

it is just a package my instructor asked us to use, i believe it is for defining mathematical symbols

im getting like 19 errors that i have no idea how to troubleshoot or fix. any advice appreciated!

these are my errors for the following code:
watermarks.tex...
watermarks.tex(1): LaTeX Warning: You have requested package `AMSsymb',
watermarks.tex(11): Error: ! Undefined control sequence ...