all those that claim the lottery is not fixed, can you explain how Cleveland won the lottery 2 years out of four that the King was gone?
Well, when a team misses the postseason in the NBA, they enter what's known as the Draft Lottery. This is a process, publicly broadcast and audited every year, when each team that missed the playoffs is given separately weighted odds in the lottery, which is held to determine which team will end up with the number one pick. Teams are given different odds of winning it based on their record, so the worst team has the highest number of opportunities to "win" the lottery and get the number one pick.
Since LeBron left, the Cavs have been in the draft lottery. Their first number one pick, that turned into Kyrie Irving, was actually the Clippers pick, acquired in the Baron Davis trade. Since Cleveland hasn't traded their first round picks since LeBron left, they've been in the draft lottery ever since, and have been fortunate enough to come out on top in two years since.
I'm glad you asked this question -- it takes real courage to admit that you don't understand how something works, especially on the internet, where knowledge is just one Google search away.