These tips will help you secure your Twitter account:
Refresh your password. If you have been using the same password for a while, it is highly recommended to change it. The new one should be strong and unique, and should not have been used in the past. Do not share it with anyone. Try to change your password every 6 months. If you are worried about remembering it, you can use a password manager.
Enable two-factor authentication (2FA). You can do this directly from your account settings. You may choose from an authenticator app, a security key, or SMS verification codes.
💡 Tip: If you already have 2FA activated but you selected SMS verification codes as your backup method, you should switch to a third-party authenticator app instead as the hacker can intercept the code sent to your phone. However, if you use the authenticator app method and lose your phone, you will need to have access to your backup codes or else you will be unable to enter your account.
Never share a verification code. A hacker may have access to a friend or relative's device, so never send a verification code to anyone. This could be used to break into your own account.
Secure your network. Avoid public WIFI, especially if you are logging into sensitive online accounts over the network. You can also get a virtual private network (VPN) to encrypt your internet connection.
Log out of devices you do not use. Remember to sign out of your account if you are not on your primary personal device. This not only includes public computers, but also extends to a friend or relative's device.
Check third-party access. You should remove access for third-party apps and websites you no longer use or trust. You can review them in your account settings under Apps and sessions.
Secure your email account. Change your password to something strong and complex, and also different from your Twitter password.