In other to have a smooth experience, it is important to know how to use the APk or Apk MOD file once you have downloaded it on your device. APK files are the raw files of an Android app similar to how .exe is for Windows. The APK means Android Package Kit (APK for short). It is the package file format used by the Android operating system for distribution and installation of mobile apps. <br> In 4 Simple Steps, I will show you how to use Theory Lessons.apk on your Phone once you are done downloading it.

Step 1: Download the APK on your device

You can do this right now, by using any of the download mirrors below. If you download the apk on a computer, make sure to move it to your android device.  

Step 2: Allow Third Party apps on your device.

To install the Theory Lessons.apk, you must make sure that third party apps are currently enabled as an installation source. Just Go to Menu > Settings > Security > and check Unknown Sources to allow your phone to install apps from sources other than the Google Play Store.
On Android 8.0 Oreo, rather than check a global setting to allow installation from unknown sources, you will be prompted to allow your browser or file manager to install APKs the first time you attempt to do so.

Step 3: Goto Your File manager or browser location

You will now need to locate the Theory Lessons.apk file you just downloaded.
If you prefer, you can also download a file manager app here so you can easily find files on your Android device.
Once you have located the Theory Lessons.apk file, click it and it will start the normal installation process. Tap "Yes" when prompted for anything. However, be sure to read all on-screen prompts.

Step 4: Enjoy

Theory Lessons is now installed on your device. Enjoy!

Are APK Files Safe?

Disregard any rumors or a site that says otherwise. APK files are generally as safe as an .exe windows pc file hence, the most important thing to note is that you should always download it from trusted sites. You generally do not have anything to worry about as we have provided some of the safest sites in the Apk download mirrors below.