Running a dryer outlet to garage
I would use EMT conduit and #10 THWN stranded wires.  One white wire and two wires that are black, brown, red, orange, yellow, pink, blue or purple.  They can be the same color.

EMT is its own grounding path, but if you want to be a completist, also run a single #10 green or bare wire. 

Terminate that at a NEMA 14-30 socket.  If the dryer has a 3-prong cord, change it to a 14-30 plug and remove the neutral-ground strap.   

Using an old NEMA 10 outlet is illegal and has been since the Bangles topped the charts. 

No more than one 90 degree curve between access points. For hard corners use a conduit body, which is an access point.  1/2” EMT would suffice.  You can put up to 4 circuits in that conduit; if you expect more than 2, use 3/4" conduit. 

Entry through the wall is also best done with a conduit body.