WIDE-ANGLE PRIMES
The Laowa 9mm f/5.6 FF RL is the widest lens currently available for the 35mm format but it is too extreme for general shooting. However, if you want to get close to the subject for dynamic foregrounds, an ultrawide should be on your list. A more gentle introduction to wide-angle photography would be 24mm or 28mm, both general-purpose lenses that give plenty of depth of field at f/8 or f/11 and suit scenics, urban and environmental portraits.