Dobsonian telescopes will give you the most bang for your buck. I'd say a 6 inch aperture at a minimum for an adult. An 8 inch will get you years down the road. The sky's the limit from there. DO NOT BUY A DEPARTMENT STORE TELESCOPE, they're junk. Orion Dobs are well regarded:

https://www.telescope.com/

A caution: like so much nowadays, telescope prices have risen a lot. You should get an extra eyepiece or two of various focal lengths, that's how you change magnification. You can also get a Barlow lens, which multiplies focal length by 2X or 3X. Telescopes and astronomy are a vast subject, barely scratching the surface here.

One of the best things you can do--find your local astronomy club, go to a meeting. They often have public star parties, attend some. The members are happy to show off their equipment and to answer questions. Learn about different types of scopes, it will help you make an informed decision when it's time to buy.