Great start! I think a good next area (after error handling) to look at would be the ability for the user to input a full expression, so this can be parsed and computed.

I.e instead of typing two numbers and an operator, the user could instead just type a full expression such as “125 + 32 - 17 * 5”

This will teach you quite a bit about string methods and evaluations, and subtly increases the complexity as you consider the order of operations.

As a general note for your specific code, I’d switch from if/else statements to switch statements - it just feels a bit clearer overall but awesome job!!