This is a very easy question to answer. For those the villain (Le)Thanos most recently stared in Disney's Marvel's Avengers End Game. And spoilers he uses six colored gemstones he got from a weird lady in a cowboy hat on the side of the road in the desert. The six stones fit into a glove he wears and make him realy strong.
The six stones are Soul, Reality, Power, Time, Mind, and Space. Currently LeBron has in his possession Mind, Soul, Power, and Space.
Ring 1 Mind: I honestly think these are all obvious but in case people weren't around back for Lebums early career he was derided as a mentally weak guy who couldn't get over the hump. Things got fucking insane after the Dallas loss. Boston Game 6 was truly when LeBron obtained the Mind stone and the rest of the ring is simply history.
Ring 2 Power: The end of the Heatles era was capped off with LeBron obtaining the power ringstone. Miami is largely regarded as Lebrons absolute physical prime. With Chris Boss only minutes away from certain death due to blood clots and Dwayne Wade borrowing Brandon Roy's knees the Heat looked in trouble. After Rio led the Heat in points it looked bad for the squad. LeBron ended up carrying them anyways and proved himself worthy of the power ring.
Ring 3 Soul: This ones for you Cleveland. Lebron returns to his hometown and despite some age has pit together what may be some of his very best seasons of basketball. With his evolved bball IQ mind and still it far removed from his absolute physical dominance of Miami LeBron out together the greatest finals performance of all time to cleanse himself of the Decision sin and bring an infinity chip to his hometown. This ring has Lebrons most iconic play and one of the most iconic calls in NBA history. Just Google "Blocked by James". LeBron played his fucking heart out and I thought he legit died with that failed dunk over Draymond to cap game 7. LeBron led both teams in all major statistical categories and proved his soul worthy of the soul stone.
Ring 4 Space: LeBron was probably filming Space James around this time.