Usual transpositions

Every chess player should be capable of transposing from one opening to another,a fact that means he knows openings quite well,which gives him the choice to transpose to openings he likes while avoiding certain variations.what I would like to know is which are the transpositions from one opening to another you most usually face/do.Thanks in advance for sharing your views and experience.

I think the English frequently transposes to a queen's gambit.

The moves that I would call "ambiguous openings" are moves like 1. b3 or 1. e3 or something like that.

Another opening which usually transposes is the French Def which after 1.e4 e6 2.d4 c5 can become a Sicilian after 3.Nf3 or to a Benoni like game after 3.d5 but you can always play 2.d5 and just play normally the French.

Also,after 1.d4 e6 many openings can be played...from QGD or QGA to Nimzo Indian,Bogo Indian,QID,Benoni maybe Catalan ...etc

Any other contributions to the forum?

I usually play some sort of Catalan as White (d4, g3, Bg2, c4, etc.).  It can start out as an English, a QGD, or neither of those.  I don't think "being able to transpose" is really a key skill.  It's important to play sound opening moves, regardless of whether ECO categorizes it as a transposition or not.

i play 1.Nf3 and I go into many

QG positions: Slav, QGA, QGD, KID
English positions: Symmetrical, Hedgehog.
1.e4 positions: Maroczy Bind, Occasionally a phillidor.
I will also sometimes go into a london system, based on some of blacks replies.