Mending/repairing...Shoes/boots?

Sort of posting here with the odd hope of drawing some eyes to this space, and because, uh...I'd really be interested in if anyone that sees this may have insights into fixing up shoes and boots.

I'd make a distinct community for the subject but I have zero knowledge of the matter, and I'd post elsewhere, but their communities are more specifically focused (e.g. tech/automobiles/etc.).

Any sort of insight/advice from say, patching holes or rejoining the upper part to the bottom (blanking on the right terms here) or whathaveyou.