Depending on your health and other circumstances, I think "aid" is a very wide subject. I am planning a home building project within a few months (depending on the pandemic situation). And although my knee and hip are better nowadays but I plan on using a cane while I am in the building site. It is true that I can walk without it, but with all the debris and scattered stuff on the ground, it is wise to have a "third leg" to add to stability and prevent possible falls.

I also plan on carrying a "survival necklace" containing a flashlight and whistle. If something happens, I can call for help.