Shri Krishna and his exploits
His teacher – Sandipani. Sage Sandipani taught Balrama and Shri Krishna.
Kansa tried hard to kill the Bal Krihsna and employed various demons. First was Pootna, who visited Nand gram and on pretence of feeding him, tried to poison. The kid took the life out of her.
Pootna (putna) was appointed by Kansa to kill Krishna
But she was killed by kid Krishna.
God Indra got angry and directed rains to flood the village. He held the mountain as an umbrella on on finger and saved his village, gokul. From his childhood only, he defeated and killed many demons. Suktasoor, Trinawurut are few of them.
in his childhood, he ate mud. After scolded by his mother, he showed three worlds in his mouth. Yashoda understood and said to herself “I am a great fool in looking upon the lord of the three worlds as my son.”
he liberated Jumlajoorun from a curse from Narada, who were born as trees in gokul. These were two sons of Kuber, who were playing in water, did not pay attention to Narada.
Krishna helping villagers by holding govardhan parvat(mountain)
He killed Aghasura, Dhenukasura who have terrorised the gokul dham.
Krishna taming Kaliya
There is an interesting story of why Kaliya nag was residing in Yamuna (Gokul).
Shri Krishna and Balrama killing Channura and Mushtika.
Krishna killing Keshi
he also killed Vatasur and Vyomasur.
Krishna killing Kansa
As per Shrimad Bhagavata Purana, Shri Krishna was 12 when he was finally being recalled to Mathura, by his Maamaa Kansa – so that he could get killed. While Keshav ended up killing Kansa as prophesized, we know that he also liberated Vasudeva and Devaki from prison upon killing his Maternal Uncle Kansa.