UPDATE--Double bathroom remodel. Need help with draining and venting.
How to install the proper venting in a double-bowl sink in a kitchen island - The Washington Post
Will a sink drain without a vent? - Quora
Canadian bathroom double vanity vent question | Terry Love Plumbing Advice & Remodel DIY & Professional Forum
How to Install an AAV (Air Admittance Valve) for a Sink
two-sink vanity plumbing - Fine Homebuilding
I believe I need to make some changes to this double vanity set up for it to vent/drain correctly? Would additions in red help? : r/Plumbing
How To Plumb a Bathroom (with multiple plumbing diagrams) - Hammerpedia
Why do some kitchen sinks need a vent? My sink does not have one, and we haven't had any problems with the sink, garbage disposal, or dishwasher. - Quora
Double Bathroom Sink - Two Different Rough Plumbing Drain Methods - YouTube
How to Install an AAV (Air Admittance Valve) for a Sink
Double Vanity Sink Backs Up On One Side…what did I do wrong on the right hand side of this picture? Assuming I am dumb with the venting. : r/Plumbing
Dual Vanity drain and vent | Terry Love Plumbing Advice & Remodel DIY & Professional Forum
How Does Your Bathroom Sink Drain And Vent Pipes Work? - YouTube
Double vanity rough in help(picture) opinion | DIY Home Improvement Forum
Bathroom sink remodel venting/drain question | Terry Love Plumbing Advice & Remodel DIY & Professional Forum