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Showing content from https://developer.mozilla.org/en-US/docs/Web/Security/Practical_implementation_guides below:

Practical security implementation guides - Security

Practical security implementation guides

Users frequently input sensitive data on websites, such as names, addresses, passwords, and banking details. As a web developer, it's crucial to protect this information from bad actors who use a wide range of exploits to steal such information and use it for personal gain. The focus of web security is to help you protect your website against these exploits and secure your users' sensitive data.

This page lists guides that summarize some best practices for implementing security features on websites. While these guides do not cover all possible security scenarios and cannot guarantee complete security of your website, following the information and best practices in these guides will make your sites significantly more secure.

HTTP security fundamentals

The guides in this section summarize best practices for implementing HTTP headers correctly to mitigate security issues, and are directly related to the HTTP Observatory tool.

Observatory performs security audits on a website and provides a grade and score along with recommendations for fixing the security issues it finds. These guides explain how to resolve issues surfaced by the HTTP Observatory tests: the tool links to the relevant guide for each issue, helping guide you towards an effective resolution. Interestingly, Mozilla's internal developer teams use this guidance when implementing websites to ensure that security best practices are applied.

The guides in the table below are listed in the order that we recommend implementing the security features they describe. This order is based on a combination of each feature's security impact and the ease of its implementation from both operational and developmental perspectives. The table provides information about each feature's impact, difficulty of implementation, whether or not it is required, and a brief description.

User information security

How to turn off form autocompletion: Form fields support autocompletion; that is, their values can be remembered and automatically filled out next time a user visits your site. For certain types of data, you may wish to disable this feature; this article explains how.