Welcome 
…
those kind of questions are a bit vague… because it all depends on the kind of scenery and also the wanted amount of detail and even style someone is up to… also in earlier versions of blender this could be very complex… but newer ones do a good job in just choosing some good options/values…
Of course their is always something to make more perfect… but also the chase of perfection needs time…
so maybe just try to follow the usual rule: what can’t be seen doesn’t belong in the scene… (at least not in that detail 
)…
So: my two cents…
The best way to find the best way is finding your own best way by yourself…
But of course there are already a lot of discusions about that… for example:
or on some other here in this community (also foundable by using the search function; top right; 
icon)
Happy blending.