This comes from Mark Sheldon, MLB reporter for the Cincinnati Reds:
What are the key dates?
First day after the World Series ends: On Thursday, following the Rangers' win over Arizona in five games, teams could resume trading Major League players, and eligible players automatically became free agents. That started a “quiet period” in which free agents may negotiate only with their own team.
Fifth day after the World Series ends: The deadline for teams and players to make decisions on contract options. Also, the “quiet period” ends and Major League free agents are free to sign with any club as of 5 p.m. ET. It's also the deadline for clubs to tender qualifying offers.
Nov. 7-9: General Managers Meetings in Scottsdale, Ariz.
Nov. 14: The deadline for players to accept a qualifying offer is 4 p.m. ET. The deadline to add players to the 40-man roster to protect them from the Rule 5 Draft is 6 p.m. ET.
Nov. 17: Tender deadline. Often referred to as the non-tender deadline, 8 p.m. ET is the deadline for clubs to tender 2024 contracts to unsigned players, including their arbitration-eligible players. If a player is non-tendered, he becomes a free agent.
Dec. 4-6: Winter Meetings in Nashville, including the MLB Draft lotteryon Dec. 5 and the Rule 5 Draft on Dec. 6.
Jan. 12, 2024: Eligible players and their teams exchange arbitration figures.
Jan. 15, 2024: Start of the new international signing period.
Mid-February, 2024: Reds pitchers and catchers report to Spring Training.