Comment by lproven

Well, here's a story about how to configure and use one that I wrote last year:

https://www.theregister.com/2022/01/07/foss_fest_foreign_let...

It's dead easy.

You type compose, then 2 (or very occasionally 3) characters which, put together, make the letter you want.

Compose, a, ` gives à. Compose, A, ` gives À.

And so on. Y,=, ¥. c,/,¢

You can usually guess the combination you need.