Question

How can you learn f block elements?

Answer 1

Throughout my entire time learning Chemistry, very few times have I ever had to discuss any of the f-block elements in any context, except for uranium (`"U"`) for radioactive decay... and maybe gadolinium (`"Gd"`)... once?

I wouldn't worry about "learning" the f-block. If anything, focus your efforts on the first, second, and third-period d-block elements; those are fair game when discussing relativistic effects, such as lanthanide contraction. ;)

At best, you may have to identify what the name of an f-block element is.

In that case, just get that down, but you should never be asked to give an electron configuration for an obscure f-block element.

(At least, I wasn't.)