The Touch Bar that replaced the row of function keys on Apple's MacBook Pros as of late has been very controversial. Many users find it annoying to not have hardware keys for volume, brightness, and playback controls that have been on MacBooks up until 2016, and the Touch Bar isn't utilized well in many applications aside from Apple software like Final Cut X or Logic. Apple just updated its MacBook Pros for 2018, however, and they now support 32GB of RAM, 4TB of SSD storage, and Intel's Core i9 processors. You can't get those new capabilities without the Touch Bar, so here's how you can make it better suited for your needs.
First of all, you can always get to the function keys temporarily by holding down the Function key on the keyboard. iMore.com also has instructions on how you can add the row of function keys to stay up while in specific applications. If you want to set it up to have it display personalized controls or information, BetterTouchTool is a good option. This tool lets you put anything you'd like in the Touch Bar in addition to setting up gestures on the trackpad or mouse and actionable key sequences.
For more on this, check out this question from episode 1509 of The Tech Guy.