Recreational / Hobbyist UAS pilot reported flying in controlled airspace without authorization.

Narrative

The day I received my first UAS drone; I did a functional check on my own property in the driveway. I followed the Drones checklist and the introductory videos to learn how to operate the drone for the first time. The app showed my house as not being in any controlled airspace. I took my drone for a hover check and hovered it in my driveway at a max height of about 90 feet. I looked at my roof and then set the drone down and turned it off. With a successful function check I was excited to use it in the future. I went to the FAA's website to learn what else I need to do with the drone and it recommended I download some other airspace apps. I did that and as I opened these apps; I learned I was just on the edge of E controlled airspace. I also read on these apps that the E airspace is a no UAS fly zone without authorization. I believe the contributing factors to flying in controlled airspace include unfamiliarity with drone operations and rules; and the Drones app being inaccurate. My corrective actions will be to use the FAA certified apps instead of my Drones App and to also do more planning even before a functional check.