While each mode is unique and important to understand, most of them still provide the basic function of flight-stabilization and assistance tool. For instance, OPTI typically features an Optiflow sensor within the drone, which is a downward facing sensor capable of identifying patterns on the ground and helping the machine to maintain a straight position.
Lead camera analyst for the PCMag consumer electronics reviews team, Jim Fisher is a graduate of the Rensselaer Polytechnic Institute, where he concentrated on documentary video production. Jim's interest in photography really took off when he borrowed his father's Hasselblad 500C and light meter in 2007. He honed his writing skills at retailer B&H... See Full Bio

The Tello is a brand new quadcopter from the world’s biggest drone company, and it retails for only $99 USD. Technically it’s a joint venture between DJI and Rize, but the important thing is that you’re getting a high-quality product for dirt cheap. A 5 Megapixel camera, 8 dimensional flips, a “throw and go” flight mode, and HD video can all be yours today – learn more by reading our full review here.
Nevertheless, no matter the dimensions of your craft it’s not permissible for hobbyist drone users to fly their machines over 400ft above the ground, plus you’re required to always maintain a clear line-of-sight with the machine at all times. Furthermore, it’s your duty to carefully inspect the device before each flight session to ensure that it’s airworthy so as to avoid unnecessary accidents. Generally, the best drones under 100 (over 50) weigh less than 0.55lbs, but it’s your duty to ensure that you fly responsibly.
As mentioned above, you will crash, and you certainly don't want to go home empty-handed. Having back-up propellers can make or break your day. Extra batteries are also a must. Current battery chemistry limits flight times to somewhere between 5 and 25 minutes for most amateur drones. Having plenty of charged spares means you can fly longer — though flying for more than 30 minutes straight can be fatiguing.
If you are a beginner just learning to fly with these cheaper drones, take your time to learn the controls by flying in a safe area that is a wide open space, with no wind, and no obstacles. At first, fly low to the ground until you can maneuver your drone correctly. Practice flying on a single battery charge and then let the drone cool down for ten minutes before flying more.  
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