@BeLimeTiger
have conversations about attitudes to financial security and values early on. It matters
I'd extend that to conversations about literally everything, i.e. finances, sex, children, marriage, families, careers, pets, retirement, homes, etc. within the first few dates, and certainly before committing to each other in any meaningful/serious way. Yes, circumstances do change over time, but that should be relatively minor "tweaks" to your life plan, not complete changes in direction dictated by one partner without full agreement/support of the other!
It's always going to be a huge red flag if either partner won't talk about such things in any serious way. Any relationship needs good communication and you need to be "on the same page" in all things.
I certainly had some pretty in depth conversations when I started dating within the first 2/3 dates which included boundary setting. My first serious boyfriend started trying to break one "red line" boundary within the first few weeks and found himself dumped pretty quickly!
By contrast, my DH (of over 3 decades now) respected my boundaries, had boundaries of his own which I respected, and we've both followed the same "pathway" throughout our lives together, i.e. marriage before buying a house before children before setting up our respective businesses. We were on the same page with finances from day one as we have very similar financial attitudes, always openly discussed buying "big ticket" items even before we started living together as we were jointly "saving" for holidays, a house, marriage etc even though not living together, so we had organised joint finances at a very early stage.
When we both started our respective businesses (many years apart), we jointly agreed how much we'd invest, timescales for starting up alongside proper jobs (business work in evenings and weekends) and "trigger" points when we'd give up our respective proper jobs (i.e. if and when the business turnover/profits hit a certain level), and a mutually agreed "give up" point where it was clear it wasn't working and to write it off and give up and accept to continue working in proper jobs! Both our respective business ideas worked, in fact, both took off quicker than expected and we were both able to give up our jobs sooner than planned to go full time into our businesses when they were making profits higher than our wages. We both trusted each other, though, to give up on the dream, if things hadn't worked out.
You really have to have mutual respect your partner/spouse. That starts in the earliest days of dating. If you aren't on the same page from day 1 and can't properly communicate, your relationship is always going to be doomed.