There ate many different types of motor that can be used in a line follower robot. Choice of motor also depends on application. To chose a motor you have to look for important features . such as:
1.RPM
2.Torque
3.Voltage
4.Size
5.Weight
6.Power consumed
etc.
After looking for these features u have to chose a motor that matches your application.
I shall recommend here some kind motors for student of Bangladesh considering availability and price. For a small size line follower u can use
DC GEARED motor like the photo of rpm nearly about 200.
U can aslo use servo motor(sg5010) after modifying it for continuous rotation. (Price a bit higher)
Do not use motor that looks like following photo or motor with no gear head. It does not give good response (From experience):
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