Hello, and welcome to OpenStreetMap!

If you're new to contributing, please make sure to read the wiki if you are unsure about anything. It contains a beginner's guide, as well as detailed information on all common map elements and standards.
https://wiki.openstreetmap.org/wiki/Beginners%27_guide

In Montreal we use an offset of 0.6, -1.54 for the 2020 Bing imagery that is the default in iD editor. If you draw or realign elements, please change your offset to this value in iD by going into the Background Settings (shortcut: B key) and scrolling to the bottom to find Imagery Offset.
https://wiki.openstreetmap.org/wiki/Montr%C3%A9al

For shops that have closed, please tag them as vacant rather than writing a description. You may also wish to remove the shop name and contact information, as they are no longer relevant.
https://wiki.openstreetmap.org/wiki/Tag:shop%3Dvacant

Thanks for contributing!