This is how in brings better typography:

Standard Ligatures (liga) combines two (or sometimes three) characters into a single character to prevent character collision, like the one between the hook of “f” and the dot of “i”.

Standard Ligatures is enabled by default. It usually has ligatures for “f-” pairs, such as “fi”, “fl”, “ff” or “ffi”. Others ligatures might be found via “dlig”.

Fonts that have this feature includes Lato, EB Garamond and Roboto. Try them with text like Clifftop and flying fish.

You may also be interested in calt, dlig and hlig.