I read this in in high school, some time between 2018-2020. I believe there was something related to dragons in the title or cover art.
The main character was in his late teens and is raised by his grandfather/father who is a healer/herbalist. The character has a triangle mark(?) and he is supposedly the chosen one because his mark has all powers of the other mark's (warrior, healer, and crafter).
At some point a dragon lady (who can transform into a dragon) comes and finds him and they go off on an adventure to awaken his latent powers. In order to awaken his warrior talent the dragon lady takes him to a village where he learns to fight and during that time the main character and the dragon lady fall in love and I believe at some point they get married.
Also a big plot point in the series is when the main character frees a bunch of giants who were enslaved and they make him a bed.
At one point the bad guy was able to corrupt another dragon that was sealed and the sealed dragon was called something along the lines of the black dragon and its human form was that of 10 year child roughly. Also during their time at the village the main character and the dragon lady fall in love and i do belive they get married. Also the main characters father also had the triangle mark and was super distraught because his son had the mark as well which meant all that he did, didnt resolve the big issue and he died shortly after that in battle. Both of the main characters parents are deceased. The giants made him a bed as a way of showing thanks because they dont say thank you if they could repay the favor, and the main character stood up for another giant and took that giants lashes for him, and when the lady transformed it was into a big dragon. The book was in English and i cant remember any character names. Healers are able to heal wound by mending and healers tend to be very sappy as the grandfather says, but when the main character heals someone he envisions it as mending a crack in a clay pot(wet clay) which combines his healer and crafter powers without him realizing. Crafter are able to manuipulate materials when making something.
A scene i distinctly remeber is the main character is doing work on a farming field and gets whipped by one of the slave with a magic/enchanted whip and instead of hurting him and cause him to feel slimy where the whip hit him, also on another occasion when he was whipped with whip that had sharp rocks in it he was able to tranform his back into stone to defend himself.