Keeping your FastField account secure does not need to be a complicated process. As long as you follow some basic security practices, such as not sharing accounts and following secure password practices described below, you will have very little to worry about.
Passwords should be at least 8 characters in length and mix uppercase and lowercase letters, numbers, and special characters. Simultaneously, it has become common practice to mix up the characters in passwords as much as possible to make them difficult to remember. It is actually far more secure to use a longer, but perhaps simpler, password or passphrase.
For example, a password such as a%9d)&fd would still be relatively trivial for a computer to crack if it had access to the stored encrypted password, and it isn't easy to remember. However, a password such as S0medayIWouldLikeAD*g is so long it would take a computer an incredibly long time to crack, making it completely impractical even to try to crack it with brute force, and it would be far easier to remember. So when you create your password, go with an easy long passphrase rather than a short, complicated password. Additionally, for the easiest way to manage complex passwords, use a password manager to create, record, and autofill your passwords for you.
2FA (Two Factor authentication)
Two Factor Authentication is a feature that adds a second code you need to enter upon login in addition to your password. This means you will sign in with your username and password, and then you will also need to enter a code you receive either by text or from an app that generates these codes.
While this sounds like it may be inconvenient, it is an incredibly secure solution. The benefit here is that if someone is trying to steal your account, they would need your username and password and access to your phone or other code generating device. The requirement of having the second physical device makes it very difficult for any unauthorized person to access your account.
Principle of Least Privilege
The principle of least privilege is the idea that a user should not have more access than they need to complete their job. With FastField, this is as simple as only providing internal account users with the appropriate roles. For example, a user who needs to administrate the system would need the Admin role, but a user who will only ever fill out forms in the field should only have the collector role, so they cannot view or modify forms or submitted data. If everyone on the account has an Admin role, it can be an issue to track who made what changes, but changes can also be made to any part of the account without prior approval.
Imagine being out in the field, and a user who should not be editing forms makes a change to the form and breaks it! The only option here would be to get someone who knows how to work with the forms to revert the change, and work in the field could not proceed until that was done. Restricting access to only the necessary roles will help to prevent any situations like this.