I. INTRODUCTION

II. THEORY  
A. Review of the kSZ effect  
B. Constructing templates from galaxy surveys  
C. Modelling

III. INTUITION  
A. Relevant redshifts and halo masses  
B. Importance of electron density and velocity templates  
D. Redshift precision

IV. FORECASTS  
A. Spectroscopic surveys  
B. 21 cm intensity mapping

V. APPLICATIONS  
A. Improving parameter constraints from the CMB power spectrum  
B. Measurement of other CMB secondaries

VI. CONCLUSION