Just to be helpful:

• Alt+Shift+Up/Down to duplicate a line (IIRC on Linux this defaults to something more complicated and it’s dumb so I changed it to match Windows and OS X)
• Ctrl+D to create multiple cursors
• Ctrl+Space to open autocomplete
• Ctrl+Period to open the little lightbulb menu that sometimes appears next to your cursor
• Ctrl+Shift+P to search for commands, so you don’t need to remember any other shortcuts

Honestly that’s about all of the shortcuts I use. The Ctrl+Shift+P menu will show you the keyboard shortcut next to the command, if it has one, so you can easily memorize it if you use a command often.

The problem is refactoring. Want to rename a method? If the name isn’t unique enough to search for, you can’t do it. There’s too much risk that you’ll miss things and create severe bugs. Of course, that can be solved with really thorough unit tests, to some extent. But then you’re just spending a lot of extra time writing tests for things that typescript will enforce automatically.

You also get much better autocomplete from the editor with typescript, which speeds up development a lot. You save a pretty huge amount of time if you don’t have to constantly look through documentation or even dig through a bunch of code to figure out what methods are available and how to use them.

Flex and grid have made CSS so easy I can’t imagine how anyone could hate it anymore. Back when everyone used float for layout, it was painful, but no sane person does that anymore.