Best Norway Fjords
 

Which would be the top three fjords to see in Norway and the best ways to see them?

Geirangerfjord can be seen from the top

https://flic.kr/p/7qsCwN
and taking a local cruise

https://flic.kr/p/7qoGvz
which, if you are so inclined, can drop you off at the base of a cliff upon which is located a historical farm. From there you can hike back to the town, or so we were told.

Only if you are young enough to handle the steep hills.

https://flic.kr/p/7qoFRe

'Best' meaning what to you?
In Western Norway:
Geirangerfjord, Nærøyfjord and Lysefjord have relatively easy access by public transport, ferry cruises and good lookout points and consequently hordes of tourists.
Others less crowded Hjørundfjord, Fjærlandfjord, Eidfjord. The great fjord systems - Hardangerfjord, Sognefjord, Nordfjord and Storfjord.
Look at the map - if there is no road running alongside then it's very steep sided like the first 3 mentioned and only accessible by boat and from viewpoints.
If you hire a car you can drive alongside - checkout https://www.nasjonaleturistveger.no/en
The first 3 mentioned are very far from each other and in many ways similar. Do avoid the mistake of driving quickly between three similar sceneries, better use your time to explore the different sceneries along one fjord. Sognefjord for example has sceneries from coast to inland, wide fjords which you can drive alongside and narrow gorge like fjord arms like Nærøyfjord. You could easily spend a week there and avoid most of the crowded areas.