Not using one. Anything and everything that is connected to the internet in any way what-so-ever has at the very least some level of insecurity and vulnerability.
I Used to think like this but having multiple different accounts with multiple different password on different site is tiring. Just for this week i forgot my password on 3 different site which apparently i already change 1 of those site password last week. Now i second guessing myself every time i try to log in on a site