When I press shift and a symbol, the wrong symbol pops up

That sounds like you have a incorrect layout selected for your keyboard input that does not match the physical keyboard and the characters printed on it.

Go to System Settings ➜ Keyboard ➜ Input Sources ➜ Edit, and make sure the correct one is added to the list.

Make sure the "Show Input Menu in Menu Bar" option is turned on, then click on the Input menu icon, and make sure the correct language and layout is set there.

click here ➜ Write in another language on Mac - Apple Support

When you check your Input Sources list, as others have recommended, make sure you have only one item on the list, and that the name of that item is US or ABC. Use the minus button at the bottom of the list to remove Spanish and any others.

Go to System Settings->Keyboard, under "Input Sources" click on Edit...

Make sure to select the correct one for you.

Sounds like you've selected the wrong keyboard layout instead of the US English Keyboard.

Have a look here: https://keyshorts.com/blogs/blog/37615873-how-to-identify-macbook-keyboard-localization

US English:

A number of other language layouts use shift-2 for "

That was standard on typewriters in the US and around the world for decades.

You seem to have the Spanish layout selected.

As mentioned make sure the correct language and layout are selected in the Input Source menu as I explained above.

Hah! I found a match. Spanish

See if that looks like what you're getting.

What Phil0124 said.

Also, can you give a concrete example of what keys you are pressing, what you expected to see and what you get?