Tool Recommendation: Glow
What?
Glow is a terminal-based Markdown file viewer. It's simple, straightforward, and just works.
Glow is part of the Charm Suite, a set of well-designed terminal tools backed by a robust TUI framework. It also has a sickeningly sweet Web site.

What makes it so good?
Glow's power is in it's simplicity. Simply type glow in the terminal and it will automatically find Markdown files for you, and will give you a menu to pick them. If you're in a folder it shows .md files in all child folders, and if you're in a Git repo it will find every .md file in the repo. Nice and easy.
Once you select a Markdown file, it displays it. You can use the arrow keys to scroll, and you can press ? to display keybinds.
Personally I generate my Web site from Markdown files, so I can get a representation of what it will look like. If you're a sotfware developer you'll be used to Markdown readme files, and this is a good way to show them. If you use AI, you'll know that Agentic AI uses Markdown instructions, and this is a good way to review them.
How do I get it?
Glow is available in Homebrew and Nix.