Question about interplanetary orbits

Hi, I have a question about orbit.

Assume we are going from Earth to an inner planet, like Venus, Mercury
for example, and we will be using a Hohmann trasfer, I am trying to
figure out at which point we need to apply some small corrections(or
called Trajectory maneuver correction in some books if I am correct),
and also what cause the satellite to drift away from its
interplanetary orbit.

I guess it might be something do to with the rotating Earth as it will
influence the orbit of the satellite but not sure about it.