What do those mean? All answers are greatly appreciated.
Different divisions or styles of yoyoing.
1a is standard string tricks, with an unresponsive yoyo.
2a is two yoyos, responsive, doing looping tricks.
3a is two 1a yoyos, string tricks.
4a is offstring, usually uses a larger yoyo with the string not connected.
And 5a is counterweight, or freehand. Used a counterweight on the end of the string instead of attaching it to your finger.
Hope this helps. 
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Look up each one on youtube. For example just search something like “2a champion yoyo”.
It’s what the internet’s for.
Thank you! Now I’ll know what people are talking about when batting about these. Before I was clueless. 
nope
YoYoWiki is your friend:
Enjoy.
(I’m sure we’ll see multiple people ask this question this week)
For all of your obscure styles
EDIT: Read the post that they said was made while you were typing >.>
Thank you!!!
Well, it’s not mandatory but, usually.
Take a look at this video which explains it all with a few demonstrations (1a is also known as single a, 2a is also known as double a and 3a is also known as triple a.)
Here are a few demonstrations of yoyo contests with those styles of play:
1a - http://www.youtube.com/watch?v=iJyQOOiV5NQ
2a - http://www.youtube.com/watch?v=hmtU6ci4nfE (go to 0:43 for the start of the performance)
3a - http://www.youtube.com/watch?v=IcZDpA80VDI
4a - http://www.youtube.com/watch?v=UbgrRaO169M
5a - http://www.youtube.com/watch?v=JvwxvgOQj_0
Hope this helps. ;D
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THANK YOU!! 
So, anyone know why 1A is called “1A”?
Maybe cause if is using 1 yoyo?
But 3a doesnt use three yoyos, and 4a doesnt use four.
It’s a numbering system, nothing to do with how many yoyos.
Does 5a have 5 yoyos? No.
Because they had a few different style of yoyoing about and decided to label them 1, 2, 3, 4, 5.
The 1A/2A/etc naming convention dates back to when yoyo contests only had 1A and 2A divisions. When the modern world contest started, the top players all competed in the 2A division. The 1A division was considered a lesser division and was more for fun, and 1A did not officially crown a world champion like 2A did (kind of like ladder/pick-your-trick competitions in today’s contests). The progressive naming probably represented the increased difficulty going from 1A to 2A (similar to how high school sports sometimes divide up into class 1A, 2A, etc based on school size), and may also have reflected that the divisions used 1 and 2 yoyos, respectively. At the very least, it made sense as a mnemonic that 1A was 1 yoyo, and 2A was 2 yoyos.
When the 1A division became more advanced, it started to split into different styles (most notably offstring and freehand), which still competed under 1A since they were 1 yoyo styles. In 2000, the world contest added an X division to represent any style outside of the two competition divisions, and the 1A offshoots moved there (along with 3A). After a few years of X division, that was split into three distinct competition divisions, and they just decided to extend the 1A/2A naming convention to cover the three new ones, even though it ended up being arbitrary.
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1A are single handed string tricks
3A are two handed string tricks (two yoyos)
5A is off string
2a are looping tricks
No probs. That’s why we’re here to help.