I have seen many domains registered on .com are on great rankings is it true that .com is the best extension ?

.ORG short for organization, is one of the most popular extensions today. Although it was originally intended for non-profit organizations, because of its huge popularity it is the most preferred alternative to .com and .net extensions. Anyone can register domains with .org extension.

if you find your desired address available with a .com extension then this is the best way to go as it is the most popular and recognised extension globally. however this is difficult due to the saturated .com market.

i would highly recommend registering with the new .co extension as this is a long replacement of .com this is where new businesses and entrepreneurs will have to look to

You rightly said, the .com is a very great suffix but you can go for .net .org if the .com is no longer available. What matter most is to make sure you are getting your keyword among hot niches whereby the need to get the keyword is high. Cheers.

It is true that com is the best! Just look at help essay !

man you are quite right.
mostly in use domains .com

Of course .com is better than .org . However,if you have to choose between a three word .com domain name and a one word .org domain name ,I suggest you to register the .org .

.com I think is the oldest extension. Anyway if it's not the oldest is the most know and also the most used.
My opinion that other extensions where made up due to the lack of characters on older extensions ( like .com ):)

i always say .com extension domains names are having more demand..i too tried to get .com domain from http://www.tucktail.com/  but i got .in only..all prefer for .com because its easy to remember for eg if u just give the domain name without extension,most of the people will try it using .com only..and .com domain is said to be more search engine friendly than any other domain..

Other extesions are also good, but you can go for them when the .com is gone. However, if you aim to flip the domain; you must make sure the keyword is strong and from a hot niche. Cheers.