As you can see in the repo, indeed "github.com/veandco/go-sdl/ttf" should work.
If it doesn’t please tell us the error you get with that.
Please keep in mind, that in 3 years a lot of changes could have been made to the library, such that it is not compatible anymore with the tutorial you are referring to (but haven’t linked).
Also please post code in future and use the code formatting option of the forum software. Do not post screenshots!