What are strong fonts?

Question

Design

What are strict fonts for business? official, strict, conforming to the rules.
Can you suggest fonts similar to the one below? Or even this particular one? Serif with serifs on the headers, I figured out - this is PlayFair display
Maybe even some examples with sites.

https://www.behance.net/gallery/37795363/Landing-P...

Answer 1

For strict corporatism, DIN is now often used (but this is gotesque and paid).

Answer 2

Top 1 font store

Answer 3

Roboto
Pt Sans, Pt Serif
Montserrat
Garamond (although this is debatable, too showy)
Helvetica (maybe everyone got it, but still a classic)
Paid ones - Muller, Proxima Nova