What is the most important thing that guys should understand about the girl, and it seems to you that they do not understand?

That we are always right

Well, as a real answer... understand you are from Mars and women from Venus. And that that's not just a phrase but that there's a lot of psychology -and anatomical / hormonal differences- behind that.
If more men would find out about that, which doesn't even require reading the book, it would make a helluva difference in finding someone, dating, relationships, and keeping a relationship healthy and going.

Respect... treat them like you would want them to treat you~~

Where does one begin?
Equality is of importance. What is good for the goose is good for the gander. Don't have double standards.

Good one Delightful!

"If an Earth girl tells you that it is her and not you, then it is definitely you."
- Leonard McCoy, M.D.

That each of us are different and we all have different perspectives, personalities, and thoughts. Just as men want to be treated like an individual person and not be compared to others, we also want that.

We don't cry on demand.

*sniffles* true, most of us don't.

Ask her. She may not be able to tell you because all humans are complicated. If you're interested enough to ask that could help.

Always say "Yes Dear" after they give an order.

You forgot... And when they disagree with you!

It's been said before. All women are different.

No need to fry any more brain cells over this one my brother!
You WILL be told exactly what it is you need to understand
and how you will react.
All 'girls' (as referred to by your good self), were created with absolute
precision. Almost perfection.
Back in the day of no electronics, of course :
. No ON/OFF switch
. No Volume control
Still ; gotta love'em, yeah?

very true.......both sides lack understanding of the other......relationships

are never one sided.....by the time we are old enough we think we know the

answers based on our experiences and maturity....

No generalization is going to be accurate so 'most important' is relative to the specific people involved.
Here is some of the wisdom I've experienced:

*Women wear their emotions different than men.
They put much more importance on them than I did.
When I learned to accept that difference, relationships got much easier.

*Just because you 'align' with a woman does not mean that you own her.
When I stopped trying to dictate how women feel, act and think, relationships got much easier.

*Women seek tenderness, intimacy and comfort.
I've yet to meet a woman who seeks to be "one of the boys" all the time.
A soft touch, gentle gaze and sincere embrace usually results in a favorable response. When I learned 'timing', relationships got much easier.

*Everybody looks to be noticed and appreciated.
Be there, in the moment, whenever you are together.
Focus on her, let her know you see 'her'. Take time from whatever you are doing to let her know you care for her. Give her three times more positive reinforcement than you think she needs. But, be honest in your praise, they can tell if you are not.

*Trust works both directions.
Once trust is broken, its nearly impossible to find it again.
Jealousy is rooted in fear. A false sense of ownership causes jealousy.
Try to realize if she is with you, she chooses to be with you. Just like you choose to be with her. Allow her the personal freedom to be herself.

Its her being her which made you choose to be with her.
Its you being you which causes her to choose to be with you.
If you choose poorly it usually results in regret.
Choose Wisely

I agree. I read this recently and it actually makes so much sense.

That no matter what you do.. its wrong.