How do you upload a built project to an Android device?

I followed the Unity guide and various other guides for installing the JDK and the SDK and using the SDK Manager, and I’ve made a project for Unity Android with some basic movement.

What I’m wondering now is how do I test the project on an Android phone? Can I upload the built project onto a website and access that website via the Android phone to download the file, or is there some other method required?

Are there any possible unwanted effects that could happen to the phone if I put a project on it, or would the worst that could happen be the application crashing?

A detailed explanation on this aspect of Android development would be a great help.

Thanks!

Connect your Android device to your computer and do a build. Should auto install and run it for you.