What do you mean by protecting the first round champion and protecting the first round top five?

In nba transactions, future draft picks are often used as bargaining chips, but draft picks also have different values. Therefore, in some transactions, the first few drafts of the first round of draft are protected. The protection of the first draft pick means that if the team that traded the draft pick in that year will not send out the draft pick, but postpone it to the next draft pick. This draft selection is not protected. Similarly, the protection of the top five rankings means that the top five rankings are not protected. This is also a game in the nba team transaction, which is very exciting.