Go to the top of the page and click on 'Talk'. That will open up into a huge list of different subject areas. Pick whatever you like!
That said, most things will go in 'Chat' and Chat is pretty busy so quite likely to get an answer.
Stay away from posting in AIBU (Am I being unreasonable) until you have read it for a few weeks and get the 'flavour' of the board. It is useful for many questions as you will get honest answers over there, but you won't get your hand held / a pat on the head / a chorus of agreement if people think YABU.
If you are struggling with something, there are very supportive folk over in Relationships, Mental Health, and General Health.
There are real experts in both SEN and in Education.
Just depends really, what you want to ask about 
If you click on the little arrow, next to 'talk' the drop down will give you 'acronyms'. that is where you will find the abbrieviations most commonly used.
Oh, and welcome.