'grasp concepts' is correct and usable in written English.
You can use it to refer to understanding or comprehending something. For example, "It took me a while to grasp the concepts of algebra."
Venn diagrams are effective methods to grasp concepts and break down text for students.
During this period the child also begins to grasp concepts of time and number.
Despite having no formal education, the Mundurucú were able to quickly grasp concepts in planar geometry relating to points, lines and triangles.
How a person identifies such dimensions, develops hypotheses (or tentative conclusions) about which of the specific dimensions define a class, arrives at the rules of class membership, and tests various hypotheses all reflect his ability to grasp concepts.
People grasp concepts in different ways, have different learning styles and learn at different paces.
But that doesn't imply anything about English speakers' ability to grasp concepts, or to develop new ways of expressing them by coining new words or elaborated syntax.
On the surface Just A Minute is built on a ridiculously easy to grasp concept – speak for 60 seconds on a given subject without repetition, hesitation or deviation.
*Facilitator decided to stop discussion because patient failed to grasp concept or refused further discussion.
He grasped concepts and really was receptive to new ideas and different approaches to the game".
My daughter grasps concepts fairly quickly and is bored with the endless revision.
"We find people grasping concepts of geometry that go beyond the perceivable".
