Woman want, in a man, strength and love.
Strength is the ability to kill animals and other men.
Love is the willingness to do so for her.
Without strength, the love of a man is worthless to a woman. See: beta male with oneitis. Without love, the strength of a man is at best useless (fuckboy) and at worst dangerous (rapist).
This is why "women want to make a bad boy good." The bad boy vaguely exhibits strength, and making him good makes that strength useful to her. (Men want to make a good girl bad because that's what smart gene selection / replication looks like.)
Perhaps due to our highly comfortable and feminized society, men do not struggle to experience love. They struggle to cultivate strength. That's why beta males are common and alpha males are not. It's also arguable that nature designed the majority of men to be thirsty betas who will serve with the hopes of getting some sexual scraps at the end of the day, while alpha males lead and impregnate abundantly.
This is why TRP emphasizes cultivating strength more than love, though I'd opine that the manosphere should address also how to better love women--from a place of strength rather than weakness.
Physical size and muscularity are obvious signs of strength worth obtaining for the purpose of attracting women, but strength has psychological manifestations which are--I'd venture--equally important.
Not-giving-a-fuck communicates a sense of security and strength which is highly attractive to females. In a large, muscular man, NGAF presents a series of stimuli to women that invokes a strong attraction. So much so, in fact, that boys will idolize that combination. See: action figures and super heroes.
Women give men shit tests to test their psychological strength--the kind of strength that isn't immediately physically apparent. Ignoring, laughing at, or immediately punishing women for shit tests communicates strength.
Men with money, power, and fame exhibit signs of an advanced form of strength--influence over other men--that is even more attractive to females than the ability to kill things. A female that is loved by a man who has power over other men will survive and reproduce. (Sadly, women will still shit test these men unnecessarily per their psychoevolutionary instincts.)
Women have an ability to discern weakness in men that is highly advanced and which they themselves do not understand. This is why it is important for men who want female attraction to cultivate actual strength rather than to merely mimmick external signs of strength (though mimmicking does work to a degree and helps men transition from weak states to strong states). To the NoFap crowd here: A spike in testosterone and dopamine will influence tiny aspects of your behavior which are subconsciously noticeable to women. This explains why female attention and attraction increases, seemingly inexplicably, while on NoFap.
If you want to date young women--aged 18 to 21, say--it's important to cultivate obvious and primitive forms of strength and to regulate the amount of love that you give them. This is because young women haven't learned the life lessons that make them more consciously search for a partner with certain traits that are advantageous to their modern, complicated life. Rather, they are driven by instinct. They want a lot of strength and are so aggressive in their screening against weakness that they'll often interpret the love that you give them as actual weakness. Being the genetic prize that they are, and being dumb as rocks, they subconsciously crave to pass on the highest quality genes available rather than actually find a beneficial partner (which, if they found, they'd reject). They want to fuck the hot, confident guy.
Dating women in their late 20s and 30s often requires you to navigate a labyrnth of emotional baggage (created by modern social ills and the general hardship of life) that creates unwanted negativity and boundaries which you must dismantle. I recommend treading lightly here. It's probably preferable to instead make a nubile, psychologically fresh young woman fall in love with you by being physically and psychologically strong and giving her an amount and kind of love that suggests to her that she's lucky to get it and better continue to earn it by being good to you.
TL;DR: Cultivate physical and emotional strength that women will be instinctively and subconsciously compelled to want to use to their reproductive advantage--by fucking you.