My baby is crawling everywhere - how do u mums manage to be vigilant at all times and Ensure baby does not do something harmful?

Usually when my baby is not within my eye view (eg cooking in kitchen), then I will put her in the exersaucer or high chair and place her near me. If you have space, you can also get a playard (or playpen if smaller space) to confine them in a small area. You can also start baby proofing the house like safety gate to the kitchen, table corners, hiding visible wires, making things are not stacked up for her to reach