2-Factor Authentication

There are several hacks that are based on cloning a SIM card. Some people even claim that password only is better than password + SMS 2FA.

Using 2FA software adds an extra layer of security to your accounts. Use it when available, and refrain from using solutions that don't have it.

Authy

Using Authy you can create an encrypted backup so even if you lose your phone you can have access to your accounts.

Authy | Two-factor Authentication (2FA) App & Guides

Google Authenticator

For Android

Google Authenticator - Apps on Google Play

For iOS

‎Google Authenticator

Password Manager

Password manager's are used to generate a unique difficult password for every page you sign in.

How to choose a password for your password manager

Choose a unique long password that doesn't include any personal information. You can use this scheme to build a long password that you can remember easily.

Password Strength

Bitwarden

Open source and zero knowledge.

Open Source Password Manager for Individuals and Teams

Keep in mind that if you lose your master password Bitwarden won't be able to recover your passwords.