An Overview -- Channel Estimation Design for Narrowband mmWave Hybrid massive MIMO -- Channel Estimation Design for broadband mmWave Hybrid massive MIMO -- Close-loop Channel Estimation Design for mmWave Full-dimensional massive MIMO -- Terahertz Ultra-Massive MIMO in Space-Air-Ground Integrated Networks -- Terahertz Massive MIMO With Holographic Reconfigurable Intelligent Surfaces -- Multi-user multi-stream Hybrid Precoding for mmWave MIMO-OFDM Systems -- Conclusions and Future Visions.