Alleykat 37

I'm new to this technology and I need to know how to manage my phone the right way.I'm getting so mad,I've tierd to do it myself but I'm so confused please I need help like what apps i really need as far as for cleaning and maintenance and how to save my stuff pics and videos using the right app to save space, And then what features I really need on and don't ,and then my play apps and my music help