The correct expression is “to bear (something) in mind”. It simply means that you need to keep something in mind (= remember it). The expression 'bear in mind' makes use of the verb “to bear,” which has many meanings, such as “to hold,” “to carry,” “to keep” and is even used as a verb to describe the act of birth.

What is to bare in mind?

To bear in mind is to be mindful of or consider something. When you bear in mind the fact that your friend is scared of heights, you won't suggest a ride on a huge Ferris wheel. ... This phrase combines the "carry or hold" meaning of bear with an old fashioned sense of mind — "memory."

Is it bear to or bare to?

Bare means naked, but to bear is to carry something. A bear is also a brown furry animal, but most people keep that one straight. If you can't bear to remember it all, just imagine a lumbering grizzly carrying a heavy load, and you'll bear this knowledge with glee!