What are the levels in GoMining?

Excuse me, could you please elaborate on the various levels or tiers that exist within the GoMining platform? Are there specific milestones or achievements that users can strive for as they engage in mining activities? How do these levels differ from one another, and what kind of benefits or privileges do they offer to the participants? I'm curious to understand the structure and progression system within GoMining, as it might impact the overall experience and potential rewards for miners.