How do I hang a large mirror properly?

The hanging tabs or wire can give a good idea of how to fasten to the wall. Make sure to get the hangers that can support the weight of the mirror.

there are mirror clips to hold mirrors in place, they hold on the edges of the mirror. Big box diy. Or you can use picture hanging wire on the back, and hang from the larger holder for pictures

You may have to put a french cleat on the back of the mirror to handle the weight.... or put extra framing in the wall to support it... Pinterest.com should be able to provide info on both

https://www.lowes.com/projects/decorate-and-entertain/how-to-hang-heavy-mirrors/project

Here is an article titled: The Right Height to Hang Artwork and Mirrors. https://www.kylieminteriors.ca/the-right-height-to-hang-artwork-and-mirrors-tips-and-ideas/

While almost every photo shows art rather than mirrors, the designer says the rule of thumb is the center of the piece should be 58" to 62" above the floor when it is the only object on that wall, or above an object shorter than 32".