Norway has a completely incredible amount of very distinct dialects... It's because it used to be quite difficult to travel around the country, and people were just staying in their own village (until recently). So each place spoke in their own way and it didn't matter very much if it became incomprehensible to everyone else. Norway has belonged to both Sweden and Denmark at different times. Bokmål is not really a dialect (it means "book speech"), it's just a way of writing, which looks quite a lot like Danish.
However, when Norwegians speak, it's much more similar to Swedish than to Danish.
Nynorsk is a way of writing Norwegian which is more similar to how people actually speak (at least in some parts of the country). But the majority don't like this way of writing anyway, only some people do, and there is a lot of debate about it. Norwegians are supposed to learn both ways of writing and it complicates things a bit for them, and wastes time.
The problem is that their written language (Bokmål) is designed to look like Danish, and it does not correspond to how people actually speak. I think that instead of having 2 written languages, they should have a reform and combine the two.
Or, they could just use Swedish Norwegian is essentially Swedish with a funny accent, a few words that are different, and different spelling.