I have a few.
One is abbreviation hell. Nobody is going to spend the time trying to decipher what you mean when you use over several abbreviations. It is just better if you’d explain than expecting people to understand aside from commonly used abbreviations that are easy to understand.
Another is overstepping your limits for the sake of getting a partner. Compromising your own standards is perhaps one of the worst things you can do when it comes to trying to find dates. Like you’re suddenly okay with dating single parents but you don’t like children. You’re suddenly okay with dating religious people but you’re not religious. Things like that. Because it means you’re desperate and you’re setting yourself up and setting them up for a bad date.
It might be just me, but all of the best dates and relationships I’ve had over the years (including my now wife) all started with a spark of attraction upon meeting that we jumped into exploring together and developed a friendship over the course of dating. My wife became one of my best friends long before we got married but that definitely developed over time, while the attraction and romance definitely came on strong right at the get go.
I had a couple times transitioned into dating friends but each time it just didn’t fit right (even if the relationship lasted a while) and ended up rather distant from them. Also too, I never had any luck dating online, they all came the old fashioned way.