"essential techniques" is correct and usable in written English.
You can use it to refer to techniques that are necessary for accomplishing a particular task. For example: "Students must learn essential techniques for solving math problems."
Julia said cooking wasn't really hard once you mastered the essential techniques.
Irish Slow Air Lessons (Sunday) This workshop will teach essential techniques for playing Irish slow airs, the rich but often overlooked form of Ireland's traditional music.
These recipes offer a simple frying primer, with the essential techniques for coating (or, in the case of the fritters, creating) food before crisping it in a couple of inches of oil.
If you believe, as Maurizio Seracini does, that Leonardo da Vinci's greatest painting is hidden inside a wall in Florence's city hall, then there are two essential techniques for finding it.
Schneider's patient but unlabored explanations of essential techniques make this the ideal book for, say, my newly single brother, who is as experienced a restaurantgoer as he is inexperienced in the kitchen.+This is the "Silver Palate" for the new generation of sophisticated eaters but unconfident cooks.
"He seemed to be more interested in onboard computers and flight systems and inflight training than in the more essential techniques of taking off or landing," said Roseann Campagnoli, a spokeswoman for the sheriff's department of Hennepin County, which includes Minneapolis.
The amassing of large, expressive structures through the repetition of small elements was the essential technique of Minimalism.
Moreover, the 3D cell culture is also an essential technique to develop the artificial organs.
The authors in [39] investigated the VM provisioning as an essential technique in cloud computing.
VE is an essential technique to implement TC methodology (Noda and Tanaka 1997).
As a summary, micro-nanorobotic manipulation is the essential technique for accuracy positioning and manipulation.
