Here is DC Motor working principle; types of DC Motor - Brushed, Brushless, DC Servo Motor; DC Motor driving using H bridge and L293D motor drivers, etc.
Brushless motor vs brushed motor: The features of the Orbray brushless motor. - Orbray MAGAZINE - Orbray Co., Ltd.
Which types of DC motors can be used as servo motors?
PN00321 - 3/8 Shaft Stepless 24V Brush DC 240W Servo Motor with 1000 PPR Optical Incremental Encoder - Makermotor
Difference between Servo Motor and DC Motor
Brushless Vs Brushed DC Motors: When and Why to Choose One Over the Other, Article
DC Motor Types - Brushed, Brushless and DC Servo Motor
Brushed DC Motors and Brushless Motors, Toshiba Electronic Devices & Storage Corporation
Brushless vs Brushed DC Motor, What`s Difference?
Brushed DC Motor Basics
Brushless (BLDC) Motors & Gear Motors