One of the best places to start is to be aware of what your riding style is and the way you ride.
Most mountain bikes that are utilized for off road rides and other actions are not going to be the ideal choice for riding inside on a normal basis.
Those bicycles which are smaller and more pliable will have a lot more advantages than those that go bigger and are intended for longer trips.
If you're going to be riding through sand, for instance, you are going to want to make sure that the bike you buy is designed to deal with this particular terrain.
There are several different types of bikes available and a number of them are very expensive while others are quite affordable.
If you are in the market for an electric mountain bike, you'll have to determine whether you would like to spend more money on one of the more expensive models or if you would rather save money by purchasing a less expensive version that will still serve you well.