I will say, that's very brave flying the EVO as your very first drone. You will definitely want to stick to wide open spaces like parks well away from people until you get more familiar with it. They are so easy to fly that you start to take them for granted until you get into a difficult situation. Below are some of the main things I can think of to look out for:
- Rebar in Cement - I recommend never taking off from cement. The rebar in cement can cause compass errors which can cause you to lose your drone. Never take off if you see compass errors. Just shut down the drone and try a different location. Personally I never take off directly from the ground, I have the GPC rugged case and always take off from the top of it to reduce the chances of buried metallic sources affecting the compass.
- Wind Strength / Direction - It is very easy to get into trouble with the wind. If the wind is blowing say 20mph and you fly downwind, you need to test the return to ensure the drone is strong enough to overcome the wind, this should be done immediately after liftoff. I typically fly upwind a few hundred feet or so to see how the drone handles before flying downwind in situations like that. Also, ludicrous mode will be needed at times to overcome wind
- Power Lines - No current obstacle avoidance can avoid them, so I recommend always doing a visual check before ever leaving the ground and staying far away from them when in the air
- Cell Towers - these are the worst....invisible bracing lines and the tower signals typically interfere with your controller. Stay away from cell towers or approach with extreme caution.
- Cranes - I work around a lot of construction sites, care must be taken around cranes which can be over 100' tall, especially the hanging hook
- Battery Life - keep track of your tablet's battery life in addition to your controller and drone. My iPad mini's battery seems to last forever so its easy to forget to check the battery levels on it when flying
- Return To Home Cancel - Learn how to cancel RTH, the problem with RTH after taking off from a difficult location such as under a tree is that if you do not cancel it if it gets triggered the drone will come down right on the top of the tree
- Blind Spots - All OA has blind spots, the OA should be a failsafe not a first choice so I you should still keep track of your surroundings and not just rely on the OA
The list goes on but those are some of the hidden problems that I can think of off of the top of my head and how to avoid them.