If you are new to cannabis, don’t bother buying a grinder. You can cut weed up with scissors until you decide you are a lifer!
If you smoke weed like once a week, try to get a little plastic grinder for free somewhere. Like the one pictured above that I got with a mug from Canuk Seeds.
If you smoke ganja every day, you should probably buy a grinder and try to gather as many free promo grinders as you can. I find the latter super handy to have when traveling.
I’d recommend getting a real, big-girl grinder from a pot-centric shop and ensuring it is one with a kief collector — or one with some other dope feature that suits you! Buying the most expensive one in the shop, definitely isn’t necessary.