At the bottom of the skill chain is aura users as a whole. While every living being in RWBY technically has Aura, actually being able to utilize it for things such as defense, regen, and senses requires years of training and a high enough degree of martial skill (and yes you actually need general skill for it) that only a small percentage of the population of the entire planet ever become skilled enough to utilize their aura. Of that small percentage, an even smaller percentage ever become skilled enough to manifest/control a Semblance (yes semblances are also skill-based). To reach this small percentage comes to the second half of the bottom of the chain: Almost every character worth their salt in RWBY has spent their entire life training in combat and can fight hordes of Grimm with little issue (Almost because Jaune exists). The entirety of the main cast of RWBY was initially enrolled at Beacon Academy, one of the most prestigious combat schools in the world, with almost everyone who was accepted there having been trained for almost their entire life to fight monsters, and each one that was not professionally trained requiring a skill display overseen by Ozpin, who has the composite skill of several thousand professional huntsmen that he accumulated over his immortal lifetime.
TL;DR, Skill Baseline = Having a lifetime of combat training, being able to solo hordes of monsters that can easily kill you if you make a single mistake, being part of the single-digit population of the planet skilled enough in martial combat to be able to subconsciously project your soul as a defensive barrier and being skilled enough in martial combat to project your soul as a superpower, and being recognized as one of the most skilled fighters in the world by a guy with millennia of composite combat skill
Thats the baseline for skill in the verse.
Ruby is well above the average Beacon student, noted as always excelling above her peers in combat training, to the point that even though she was two years away from being eligible to join Beacon she was admitted due her combat prowess impressing Ozpin, with him noting that she was already a master at wielding one of the most dangerous weapons ever designed (Again, Oz is tens of thousands of years old and has spent the majority of his lifetimes training in combat as well as training other huntsmen and even entire armies). Even before the Beacon Arc Ruby had been personally trained by her uncle Qrow, one of the most skilled professional huntsmen on the planet, and had heavily inspired her fighting style from his. In combat Ruby is capable of taking on entire hordes of Grimm on her own and walking away without a scratch and utilizing the different functionalities of the Crescent Rose, such as the massive recoil from the rifle aspect of the weapon and the weapon's transformative capabilities, in tandem with each other and her Semblance in order to maintain an edge over her opponent. Basically every named character is around this level of skill in the early seasons.
Now for Velvet. Velvet is able to perfectly and instantly mimic the exact moves that she observes other people use in combat as well as utilize multiple different fighting styles simultaneously, both armed and unarmed. Thanks to Anesidora, Velvet is also able to copy fighting styles that utilize weapons, and she is able to wield the weapons that she copies just as effectively as their original user. To date that we know of, Velvet is able to simultaneously utilize the fighting styles and weapons of Ruby Rose, Yang Xiao Long, Weiss Schnee, Blake Belladonna, Nora Valkyrie, Sun Wukong, Penny Polendina, Coco Adel, Peter Port, Reese Chloris, Fox Alistar, Vega Bleu, Yatsuhashi Daichi, Russel Thrush, Roy Stallion, Neptune Vasilias, Brawnz Ni, Bartholomew Oobleck, Flynt Coal, Edward Caspian, and Scarlet David. Of note, every person listed spent their entire lives training in combat and several of them are professional huntsmen with decades of combat experience.
Moving up the chain we have Nebula Violette, who not only outmatched Velvet in a 1v1 test of martial arts skill, but was directly stated to be more skilled than Velvet in combat despite Velvet mixing numerous fighting styles to try to throw her off in their fight.
Simply put, Ruby in this arc is comparable in skill to Blake, who in turn is comparable to Sun who is stated in Before the Dawn to be more skilled in combat than Scarlet David who outmatched Nebula in a 1v1 fight.
As for her own feats, on top of the stuff from before, Ruby has become skilled to the point of mastering her semblance, and doing so to a degree that using it in combat is, as described by Ruby herself, effectively instinctive. She regularly uses it both in cqc and at a distance, able to constantly stay in her opponent's blind spot and using her massive speed amp to avoid attacks while also constantly attacking, as well as having the ability to use it to rapidly put a massive amount of distance between herself and her opponent if need be, allowing her to pepper the opponent with ranged attacks from unpredictable angles while keeping out of their range. Her marksmanship also increased to the point that she can curve the trajectory of her bullets to hit targets that dodged her shots.
Ruby is also a highly competent analyst, and due to her obsession with weapons she has the ability to tell the exact function and mechanics of new weapons just by looking at them for a few seconds, including understanding their weaknesses and how to exploit them. She's also the strategist and tactician of her team, having come up with plans on the fly to beat Grimm that were strong enough to overpower each member of her teams individually, as well as understanding her teammates' techniques, semblances, strengths, and weaknesses to the point of being able to create entire tandem attacks and fighting styles for each pairing of her team members to maximize their combat ability while exploiting their strengths and covering their weaknesses, something that has allowed them to defeat opponents that were sigificantly stronger than each member individually.
TLDR, pretty ****** skilled
