How to Participate in Polkadot Parachain Slot Auctions? When Do They Start?

What is Polkadot parachain slot auction? What is the auction process like? PolkaWorld: Polkadot consists of a relay chain + a bunch of parachains. Parachains can enjoy Polkadot's shared security and can interact with other parachains, making them very valuable. However, the number of parachain slots on Polkadot is limited, and these slots are called "slots". Projects that want to become parachains and connect to Polkadot need to compete for these slots. How do they compete? Through slot auctions, where each project can lock DOT tokens to participate in the bidding.