Bu kitabı kolayca okudun
kolaylıkla, kolay kolay, kolay, kolayca. are they all adverbs?
"kolaylıkla" is actually from a noun and it would literally be more like "with ease" in English. "kolay" is an adjective (but adjectives are often used as adverbs). "Kolayca" is an adverb. "kolay kolay" is also an adverb, but isn't very common.
Is it correct to say .' Sen kolayca bu kitabı okursun '
Or the adverb should proceed the verb as a rule ?
Late response, but yes... Adverbs should proceed the verb. :-)