According to Jiraiya, Minato was easily one of the most gifted Leaf shinobi ever to live. So much so, a flee-on-sight order was given to enemy shinobi during the Third Great Shinobi War. Minato’s brilliance became evident from creating several distinctive techniques, including the Flying Thunder God Technique, which essentially allowed him to teleport to any location with the use of a special seal. He also created the Rasengan, a technique that does not rely on hand signs, but instead uses a concentration of spinning chakra in the palm that causes immense damage to its target on contact. Later in the series it is revealed that this signature technique is actually incomplete. Minato had planned to add his own nature manipulation training to the Rasengan, making it even more powerful, but couldn’t manage to combine the two prior to his premature death. Minato’s possibly last technique was the Dead Demon Consuming Seal, which was used to seal the demon fox into Naruto, at the cost of his own life.
It is unknown exactly how strong Minato was in combat, but he is considered by many as quite possibly the most skilled ninja the Leaf Village has ever produced. He earned the nickname Konoha’s Yellow Flash either because of his unrivaled speed and equally impressive use of it or for his creation of his Flying Thunder God Technique and the yellow light that accompanied the use of it (more than likely his hair flashing by). Once, during the Third Great Shinobi War, he was able to defeat 50 enemies using the technique by having other Konoha Shinobi throw his specially inscribed kunai at the group. It appears that he teleported from foe to foe, cutting them down instantaneously, as he was able to defeat them all in a matter of seconds and without a scratch.