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Good question! Japanese kids confuse them a lot.

合う=fit, match, agree with, suit, go well with,

会う=meet, see

basically the difference is 会う is for human and 合う is for other things.

逢う=come across. this one has more beautiful meaning so it used for many songs. ;watashiwa kareni meguriatta(past of meguri au)=I finally met him. it includes meaning of "destiny" in good meaning.

遭う=meet with, encounter. it has bad meaning like an accident, incident, disaster.

遇う=meet(by chance). it doesn't have to be bad meaning

It is agreeable合う and It meets 会うthey are close meanings in japanese you could use either one in japanese あう is the basic hirigana alphabet for elementry kids and foreigners can understand japanese easier

合う：unit　together,fit　in,match,suitable,

会う：meet

sometimes　I am　confused as well.　

There　are　many　meanings　ｏｎ　”あう”.

it　looks　like　”have”,”make”　in English.

and also we can write "あう”

”会う、合う、逢う、遭う、逢う”

but　we　use　会う、合う　mostly.

I　 hope　your　help.

Oh yes:-

?? = confused

??? = Well confused

Duh, I dropped my pencil.