Use Junk Skills to Become the Strongest

This incompetent failure! I have taken care of you for so many years, but the farmer's only skill is poison resistance? How shameful! At my 15-year-old coming-of-age ceremony, I was gifted with the peasant skill of being able to resist poison as a gift from Heaven. I was born as the eldest son of a swordsman family, but I was deprived of my position as the head of the family and kicked out of the house amidst my father's insults. Confused and helpless, the road ahead is uncertain, but he discovers that his ability to resist poison is actually immunity. Then, I encountered an ancient book. During my encounter with this book, I seemed to... My father had a very bad opinion of me, treating me as a failure and an incompetent kid. As the eldest son, my father had spared no effort in treating me over the years, but his only natural skill was the ability to resist poison. This was simply embarrassing in the eyes of my father, so he deprived me of the inheritance rights of the head of the family during the coming-of-age ceremony and kicked me out of the house. At this moment, I am helpless and the road ahead is vast. The only consolation is that I discovered that my ability to resist poison is actually immunity, which means I am absolutely invincible. Then I came across an ancient book. In the process of reading this book, I seemed to have found the direction of my life. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.