Basic Information
Name:
Here you state the name of your character.
Nickname:
Here you state your character's nickname(s), doesn't have to be canon, you can make them up as it's not really so important.
Gender:
Here you state your character's gender. Male, female or whatever's in between.
Age:
Here you state your character's age. Be logical, no shinobi is 566 or 2 years old.
Clan:
Here you state the clan your character belongs to. A lot of canon characters don't belong to an official clan or simply their clan has never been stated. If this is the case or, when you make a custom character that doesn't belong to a clan, you don't need to write anything.
Looks:
Here you describe how your character looks like what kind of cloths he wears and what kind of physical appearance he has. You can also just add a picture of your character here instead of describing him or refer to pictures that are posted elsewhere in your bio.
Personality:
Here you describe the personality of your character. Is he timid? Serious? Goofy? Schizophrenic? Etc.
Village Info
Village of Birth:
Here you state the village your character was born in.
Village of Alliance:
here you state to which village(s) you are allied to, though it's not always clear for canon characters. However it's not really that important and doesn't have to be filled in if you stated your Village of Birth, however one of these two always has to be filled in and if you didn't fill in VoB, you need to write something in VoA that conforms with your history.
Rank//Chakra Info
Ninja Rank:
Here you state your rank, meaning the rank that you can see under your avatar that's based on your post count. The rank your character has in the story if it's a canon bio doesn't matter. In the Battle Ranks thread you can see which amount of posts you need for which rank and what you can learn when reaching those ranks.
Specialty:
Here you state where you excel in, meaning the few things you are better in compared to all the other skills you know. However in normal circumstances there shouldn't be anything mentioned here in your first bio and it's up to the mod who checks the bio to decide whether you deserve all the specialties you stated or not.
Elements:
Here you state all the elements you learned, whether your character is canon or custom doesn't matter and neither are the elements your character uses in the story if it's a canon one. In your first bio you can state the first element you want to learn and add that you still need training in it, in all the other bio's you only state the elements you actually had training in, nothing else and certainly do not start listing all the elements and just say you need training in them.
Your ninjutsu:
Here you list all the jutsu's you have learned. This includes taijutsu, genjutsu etc. You can also list your elemental ninjutsu's here too, though some people already list those under Elements. The jutsu's listed below are the basic E-rank academy jutsu's and are the only jutsu's everyone gets by default and these have to be stated in your first bio. When you learn more and more jutsu's, you are not obliged (and it's even advised not to) to post every single one of them individually. Most people solve this by just writing it for example like this:
Genjutsu - up to C-rank
Taijutsu - up to B-rank
Ninjutsu - up to B-rank
etc.
The jutsu's listed below are the basic E-rank academy ninjutsu and you get them by default. After a while, when you know more stuff, you are not obliged to add them anymore.
Background Info
History:
Here you state the history of your character. For canon characters you just follow their normal history, but if it's a canon character that has died, you only write history from before its death. Histories of custom characters have to fit the Narutoverse and thus can't have contradictions with it, even stuff that is in theory not impossible, but is in reality practically BS is not allowed. There is a small exception though, people that have been RPing for a long time can write histories in custom bio's based on their own adventures, even if they contradict the Naruto plot. However in the latter case you can't combine the real Naruto plot with stuff from your own adventures that contradict the plot.
Other
Picture:
Here you can add pictures of your character if you haven't done that yet somewhere else in the bio. It's not really that important and doesn't have to be filled in if you described your looks earlier.
Theme Song and Background Music:
Some music, not really important. Most people post YT vids, but other people just add the name of a song.
Battles
Won:
Here you state the amount of battles you officially won in our RP system, meaning that any made up fights in your history do not count and that in the case of a canon character, its battles in the Naruto plot do not count either. Thus logically in your first bio you have 0 wins.
Lost:
Same comment as above, only this time for the battles you lost. Some people count every battle they ever fought, while others only count the battles they fought with that specific bio, it doesn't really matter what you choose to do.