What are the features seafile server?

Seafile Server
1

I am a novice user to use seafile and I do not know much about the features seafile, anything for the community version seafile private server?

whether seafile superior to the other?

2

Look here
https://www.seafile.com/en/product/private_server/
Scroll down to Feature List.

3

whether the user is limited?

4

If you are going to use the CE (= Commnunity Edition), the users are unlimited
If you use the Pro Edition for free, you can use up to 3 users for free
Otherwise you have to pay for the Pro Edition as shown on the page @fabianT already posted.