Caret vs IntelliJ IDEA

The single pane formats your MD as you write it but retains the markup so you can see what's going on.

Hit ⌘ G to see document titles in a hierarchical view, type and use the arrows to navigate.

Hit ⌘ T to browse current folder, navigate the file system and manage your files and folders, type to search, right click to create / move / rename / delete items.

Make ten changes at the same time, not one change ten times - lets you edit multiple lines at once, perform quick and selective find and replace, etc.

Hit "Enter" to fix spelling, convert list to ordered/unordered/task, convert reference link to inline, jump to reference link definition, jump to footnote definition, visit links, etc.

Auto-completion for paths of links and images, keywords in fenced code blocks, emoji, etc.

Renders LaTeX math expressions as soon as you have finished writing them.

Hit ⌥ ↑ to extend the current selection to the next biggest element and ⌥ ↓ to shrink the selection.

IntelliJ IDEA is really easy to work with when it comes to test-driven development in Java and JavaScript/TypeScript.

Really good support for importing classes, libraries, etc. into a typescript class. Making it easy to do TDD.

It can make one more efficient, but also can get one way too used to shortcuts, autocomplete, and easy debugging.