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.
A friend commented on my wife and I’s attachment style the other day and yeah that’s a big one. I naturally have a disorganized (leaning anxious) attachment style and my wife naturally has an avoidant one. But from the beginning we did the work to reinforce secure attachment thought patterns in ourselves and it’s made a world of difference. So yeah, a lot of people could really use to work on their attachment style