Do the Spy Apps Really Work?..Multiple Questions I've Pondered.

I don't have the first clue About software or anything in that nature. I was wanting to explore the world of hidden sites. I download a few apps to help me out. After I stumbled upon spy app like microphone blockers/ wire taps / and message protectors. Do they really work? If so how do they work? Is it possible to hack my phone to protect it from being tapped!

I have so much I want to learn. My main focus is to learn how to bypass government caps while researching. (Hidden information,studies,researches, and Exe) while researching I can't ever seem to find the information I seek. Only what they want us to know. Please help a friendly nurd discover the ugly hidden truth