Want to install better car stereo but am confused how to make sure what I buy will fit into my car? Confused?

I want to install a new stereo system in my car and see those cars out there with the big screens on their stereos and I want something like that, but I have a 1993 honda civic and am honestly confused on how I would buy something like that and it would fit into the dash of my car. Do I have to buy something the exact same size? Do they come with speakers too? Can anyone give me any ideas on where to start. I'm really confused.

Go to your local auto audio specialist and ask them. Usually, anyone who sells auto audio will have an installer. Ask them.

You can also go to crutchfield.com and use there Find What Fits Your Car option. Its on the lower left of the page if you scroll down on the homepage.

Just do it on eBay type in your car then what you want