Guys, thank you..
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And...how I increase HP? I get hurt, and I am not sure how to heal :O I thought maybe sleeping will return HP, or eating..
You can buy tendstims in certain shops like the general store near your house. Then you press the tendstim button located in the lower part of the screen, near your favorite NPCs portraits.
You can also assign nurses in NPC Menu -> Jobs and Titles. It's a title that you can grant them and is more effective if they do not have other jobs and are not followers once midnight hits (midnight is where most of the stat calculations happen). NPCs with 25+ stat in medicine will heal you and any hurt NPCs. You can hire Aiko or some other mercs with good starting Medicine stats. Caitlin, once you purchase her, starts with the second highest medicine stat among the unique NPCs (at 70, second only to Eve at 100). Some random captures can also RNG into high medicine stat. Some unique captures starts at a decent medicine stat too like Cassius Bauer and Truls Baardson.
If you assign a girl with medicine stat lower than 30 to the Academy (clear her jobs, go to NPC Menu -> Academy -> Administration and Domestic), she can increase her medicine stat, up to ~30 which is that course' medicine stat cap. Afterwards, homeschooling seems to be the only way to increase it reliably from ~30.