Security below iOS 11

Q - What is the best possible defense, selection of settings, or counter measures towards actual hacking ? Changing passwords may indeed, bear success if one suspects, yet I chose Developer forums in hopes of catching a seasoned eye to read the following... The iPad features/programs become shared if lucky, upon an incident. Email, sound, cloud, basic settings, Safari, auto download updates to Books, your blinking cursor while typing are all lost. Every word typed is seen and Communication is possible. To receive it, I open a fresh email draft. Tap the space bar as letters appear forming a sentence. My hacker (no longer foe) opens safari, brings up/logs into sites as I do to illustrate points in conversation. One can change settings to allow himself free will with a certificate every company accepts as trusted. Just a few details for Developers, surely this isn't fiction to everyone... **Q - How can one combat that ? ** Any ideas or advice ?