The new MacBook Pro comes with two or four external ports, depending on the model you pick. But those ports are only of one type: Thunderbolt 3, which is compatible with USB-C.

But you probably have devices that use USB-A, Thunderbolt 1, Thunderbolt 2, DisplayPort, HDMI, or something else. How do you connect these devices? With an adapter.

If you’re planning to buy a new MacBook Pro, make sure you set aside a considerable amount of cash for the adapters you need. Apple doesn’t include any in the box, except for a power adapter.

Your best bet is to get a combination dock, like the Satechi Slim Aluminum Type-C Multi-Port Adapter ($60 on Amazon). It connects to the MacBook Pro via USB-C, and includes a USB-C pass-through port, two USB 3.0 ports, and an HDMI port with 4K (30Hz) support. With this, you don’t have to carry around multiple adapters.

If you don’t want a dock, or you can’t find a dock with the mix of connections you need, Apple or another company probably has an adapter for you.
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https://www.macworld.com/article/3136583/macbook-pro-thunderbolt-3-adapter-guide-how-to-connect-an-iphone-display-hard-drive-and-more.html