I've been lurking and following along, nomming on my popcorn...
... I am Gen X, and tried online dating for a few years following my very long marriage ending - it was a huge eyeopener. I learned may red flags etc. and I'm now mostly jaded and disappointed in what passes for single 'men' in my area.
One thing I can add is this:
ALWAYS GOOGLE, and check them on LinkedIn, and Facebook etc. Always do it. Fact check. Some people said I was "spoiling the magic" - no, I was finding out if they were a lying son of a biscuit before we went on that date, and that I was going to be safe.
And if you find he's married on Facebook? Consider contacting the wife. I've also contacted the wife if he claims to be poly, to find out - no - he's not - he's just a cheating d!ckb@g.
Homework: learn terms like "ghosted", "benched", "breadcrumbing", "negging", and "submarining"

it's a whole new world and lingo.