[strogonoff]

If finding types is especially difficult, it may depend on a particular library (poorly documented types) and on the tooling you use (e.g., VS Code allows to quickly jump to definition/implementation/etc. on any imported class or component in your code, which often takes you to the place in that library where you can find out which types you need and where to import them from; it was a bigger pain in Vim).

By the way, keep in mind that it is often unnecessary to specify types explicitly because TS can infer them from context. I used to specify way too many types when I was initially learning TS.