That's because there is a lot of leeway.Trying to figure out composting. Every site I look at has different ratios and lists and instructions

Some things are "less good" than other things. If you're using an enclosed bin, you don't have to worry about attracting critters. Meat and bones can and will compost, but they might stink, and my open bin would get a bunch of possums or whatever rooting around in it.
As mentioned, avoid any diseased plant material, as the diseases can pass to the soil and infect the next year's plants.