According to the US Foreign Service institute, it's no harder than french or spanish. Only Esperanto is considerably easier.
Amsterdam is not a country. If it's the weed you're after, you can get that in 9 provinces of the netherlands if you're over 18, or in all 12 if you can prove you're a resident of the netherlands.
Unless you have work-skills that are in short supply (nurse, technician), forget about moving here.
I don't know what fkra is, but learning dutch to fluency is supposed to take an anglo 24 weeks of class, or a year in the country
Learning Dutch is considered pretty hard, even for people who have not too many difficulties with learning the basics of other languages. That is because the proper pronunciation is hard for speakers of almost all other languages.
Basic Dutch with a heavy accent is not too bad, most people who want to can get started within a few weeks or months of learning. Which is likely what the US Foreign Service Institute thinks is enough.
Learning the language as it should be spoken, up to fluent, is hard and harder still when you do not live with the native speakers of Dutch.
No way you can learn it with just 24 weeks of class, unless it is a total immersion system.
One year in the country is also not enough unless you live with Dutch people who teach you 24/7.
One of the problems people learning Dutch complain about is that they do not have much chance to use their Dutch as all Dutch people switch to English as soon as they detect an accent (any accent, even more when English is your native language.)
Pronunciation of Dutch is not easy, for almost nobody, and learning speak Dutch like a native is known to be very hard for people of every language. Only if you happen to have several languages that together cover all the different difficult sounds in Dutch you may find it 'easy'.
And yes, it is not as easy to move to the Netherlands as it is to move to the next city in your own country, but it is not completely impossible. Before you start learning Dutch you might check out the options and difficulties in settling in Europe/the Netherlands.
Living in Amsterdam is not cheap, it is one of the worst places to live in the Netherlands price wise, on par with the Hague and some more inner cities.
Not as bad as London, but not good either.
Moving to other European countries will not help either, all have alike but not identical rules.
(And I also do not know what FKRA or fkra you mean, google did not explain it.)
As a written language its fairly easy to learn. I quickly learned to read Dutch without a problem.
Speaking it is another matter entirely. The pronunciation of the vowels is very precise which can be difficult for English-speakers to master. Vowel-pronunciation is less important in English, hence Americans can understand English and Australians and Irish and vice versa without any problems.
The guttural Dutch "g" can be a problem for some as well, as we don't have that sound in English and speaking it doesn't come naturally.
The biggest problem I found in trying to learn Dutch when I lived in Amsterdam was finding natives who would talk back to me in Dutch. Most within a sentence or two would realise I was English and answer me back in my own language.
What's your nationality? If you're not an EU national, you won't be moving to NL unless you're independently wealthy or a member of a highly sought-after profession like medicine.
Make sure you can get a work permit first, or you won't be moving. Moving across the Atlantic is really hard these days, in both directions.
