Meaning of the word "be sure" in English

What does "be sure" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

be sure

US /biː ʃʊr/
UK /biː ʃɔː/

Idiom

to be certain or confident about something

Example:
I want to be sure that all the details are correct before we proceed.
Please be sure to lock the door when you leave.