I live in an area where tons of data is missing. I mean the whole areas with no street addresses, missing streets, missing bike routes, etc.
Is there a guide or special tools for preparing to make massive edits like this? Is there a particular work flow that people use or resources? How do I even get started?
Unfortunately there’s no local group
Then ask the neighbouring group if there’s not even one on the country level. It’s really best if you talk to those people who map in the area or next to it.