It is possible for a swordsman to use more than one Breathing Style technique at a time, allowing the user to take advantage of the advantageous aspects of both techniques. Tanjiro Kamado, for example, can use both the Water Breathing and Sun Breathing styles simultaneously.
The only known Demon Slayer who is capable enough to have two Breathing Styles at his disposal is Tanjiro Kamado. He initially started without any knowledge of Breathing Style and had no prior training in swordsmanship.
Well, in the manga, does master the Sun Breathing style. Apparently, Tanjiro sees Yorrichi Tsugikuni, the creator of Sun Breathing, performing all forms of the breathing style. Interestingly, Tanjiro sees Yorrichi using the technique through Sumiyoshi's memories, an ancestor of the Kamado family.
Yes he uses the proper breathing technique of lightning and it seems like you're asking if Tanjiro can use the forms of the breath of the lightning, Breathing technique and the forms of the technique is (2) different things so the answer is No.
The last user is Tanjiro Kamado, who learned the Breathing Style from his father, Tanjuro Kamado. Other people can learn this technique if taught by a Kamado descendant.
The Thirteenth Form of the Sun Breathing Style is unique in the sense that it doesn't really have a name of its own. Rather, it's a combination of all the twelve forms present in this style, used in succession to maximize their power. This move was devised by Tanjiro solely to defeat Muzan.
Thunder Breathing has 6 standard forms in total, with the first form said to be the foundation for all the other forms. However, Zenitsu Agatsuma developed a Seventh Form in order to stand on equal ground with Kaigaku, his former senior disciple under Jigoro who had become the Upper Rank Six of the Twelve Kizuki.
There are six forms, but Zenitsu could only learn the first form said to be the basis for the others yet he honed it to where he could fight against several strong demons. He later created a seventh form and defeated his former senior who had become the Upper Rank Six of the Twelve Kizuki.
When Haganezuka sees Tanjiro's reddish hair, he becomes hopeful that he will get to see a bright red Nichirin sword. However, once Tanjiro unsheathes his weapon, the blade turns a dark black, to the concern of Urokodaki and the anger of Haganezuka.
Only the Kamado family wields the Sun Breathing; that's why Tanjiro remembers his father performing Hinokami Kagura.
Though he's on a journey to get over his fears and wants to be a better version of himself. However, as every Demon Slayer affiliated with a Breathing Style develops certain forms which give them an advantage in combat, Zenitsu could only learn the first form of Thunder Breathing: Thunderclap and Flash.
In the far chapters of the Demon Slayer manga, Tanjiro is actually turned into a demon by Muzan Kibutsuji. Muzan does this to continue his demon legacy and live in this world even after being dead. He chooses Tanjiro over everyone else as he considers him the perfect one to carry on his legacy.
Tanjiro is a beginner at using Sun Breathing, as it drains most of the energy and strength. Moreover, extreme usage of this technique could restrain the movements of the user for a short period.
1/10 Tenth Form: Constant Flux/The Dragon of Change
The most powerful water move in Tanjiro's current skill set, this is a form that gets more and more powerful with each rotation that he puts in. It's number one on the list because it has, theoretically, no ceiling when it comes to its intensity.
17/17 Water Breathing: Fourth Form – Striking Tide
It uses flowing movements, allowing its user to perform multiple consecutive strikes to overpower their opponents. Using this form, he was able to take down two demons, an impressive feat considering how little experience he had up until that point.
Zenitsu creates his own form called Seventh Form: Honoikazuchi Nokami. Through this form, he is able to conjure a creature akin to a dragon that breathes thunder and fire. When combined with God Speed, his power and strength increase, giving him the ability to defeat demons like Kaiju, from the Upper Moon Six.
1/7 Seventh Form: Honoikazuchi No Kami
This mastery allowed Zenitsu to form a Seventh Form of Thunder Breathing that is unique only to him: Honoikazuchi no Kami. While this move might seem similar to Thunder Breathing's First Form, the speed and power of this technique are on a whole new level.
When facing Kaigaku during the Infinity Castle arc, Zenitsu debuts his brand new exclusive Seventh Form to Thunder Breathing. With this, Zenitsu finally has more than one tool in his arsenal and has overcome his own personal doubts and fears.
It was after Daki unleashed an attack and harmed multiple people, Tanjiro was extremely angry at this that his eyes were turning blood-shot red.
Zenitsu always performs a single form because that is the only form he knows. His attack always start with this positioning, and end result is this way.
Zenitsu Agatsuma only uses one move (in anime up till now) , I.E. Thunderclap and Flash, because he hasn't learned the other Thunder Breathing Forms. He never wanted to learn any breathing techniques or fighting techniques nor he wanted to join the Demon Slayer Corps.
Even 400 years later, Muzan's fear of Yoriichi remained fully intact, as simply laying eyes on Tanjiro's hanafuda earrings caused him to recall their clash.
This Breathing Style is solely used by Michikatsu, who was one of the first Demon Slayers who utilized Total Concentration Breathing. Even after he became a demon, he continued to use it.