I know that there are many Turkic languages , accent, dialects and types of Turkish like:
-Istanbul Turkish (Official language of Turkey)
-Ottoman Turkish (Official language of Ottoman empire)
-Azeri Turkish (Official language of Azerbaijan Republic)
?stanbul Turkish is Ottoman Turkish. And, Azeris are Turkish. The language they speak is also Turkish, a dialect of it, but most definitely not another language. If you call what Azeris speak is not Turkish, then what Austrians speak is not German either.
It depends on where you are from. Turkish is an Uralic-Altaic language. So, it is really hard to learn for a French, Arabian or a Chinese, while it is easy to learn for an Estonian, a Hungarian, a Mongolian or a Finnish person. (Not saying Azerbaijani, Kirghiz, Kazahk since they already talk Turkish just in different dialects)
Ottoman is a not a spoken language but it was a written form of Turkish used in court or by court poets .
official so called Istanbul Turkish is actually a simplified and reduced version of Turkic. you want real Turkic? go for Azerbaijani Turkic. much more thorough but its still not the version i would really prefer.
Yes it easy,and interesting.