[pkaye]

For VSCode crashing, no suggestions since I've never seen it myself. You could try deleting the config files in your "home" directory and run from scratch.

Which language are you trying to autocomplete. For some like Javascript/Typescript, it works out of the box. For many like Golang, C++, Python you need to install a plugin but takes just a few seconds. Also for autocomplete to work across files, I think you many need to open the whole directory ("file/open folder..." menu item.)