To chanjits: Hello

[hoorge]

Thank you, Chanjit.

So, for potraits, I should stick to wider appertures? What about when I capture buildings or architecture?

[chanjits]

It depends upon what you want to show for example there is row of pillars and you want to show all the pillars in detail so narrow aperture means f/8 or more will be suitable but if you want to show closer one in sharp focus and other bit blur then use wider aperture here I want to explain what depth of field means? It is the sharp area before and after the focusing point, if you want to take more sharp area where you are focusing then use narrow aperture and this will render you great depth of field like we need in landscapes and when we use wide aperture it gives us shallow depth of field means small area near the focusing point will be sharp like we need in portraits where we want our subjects more distinct from backgrounds so in order to blur the background we use wide aperture like f/1.4 or f/1.8 so on but I think your lens only have widest f/3.8.
SO DEAR DEAR THERE IS NO HARD AND FAST RULE THAT YOU USE THIS APERTURE FOR LANDSCAPE OR THAT FOR PORTRAITS SOME TIME IN LANDSCAPE YOU WANT TO SHOW ONLY A BOAT OR TREE DISTINCT SO USE WIDE APERTURE AND SOME TIME CLICKING PORTRAIT YOU ALSO WANT TO SHOW BACKGROUND IN MUCH DETAIL THEN USE NARROW APERTURE.