# How-to Guides

- [Author a Masking Data Policy](https://documentation.immuta.com/SaaS/govern/secure-your-data/authoring-policies-in-secure/data-policies/how-to-guides/data-policy-tutorial.md): Build a policy that masks columns for users
- [Author a Minimization Policy](https://documentation.immuta.com/SaaS/govern/secure-your-data/authoring-policies-in-secure/data-policies/how-to-guides/minimization-tutorial.md): Build a policy that limits the amount of data returned for users
- [Author a Purpose-Based Restriction Policy](https://documentation.immuta.com/SaaS/govern/secure-your-data/authoring-policies-in-secure/data-policies/how-to-guides/purpose-tutorial.md): Build a policy that limits access to a specific purpose
- [Author a Restricted Data Policy](https://documentation.immuta.com/SaaS/govern/secure-your-data/authoring-policies-in-secure/data-policies/how-to-guides/restricted-data-policies.md): Build a data policy that only applies to data sources you own
- [Author a Reveal Policy](https://documentation.immuta.com/SaaS/govern/secure-your-data/authoring-policies-in-secure/data-policies/how-to-guides/author-a-reveal-policy.md): Build a policy that automatically grants exceptions to masking policies
- [Author a Row-Level Policy](https://documentation.immuta.com/SaaS/govern/secure-your-data/authoring-policies-in-secure/data-policies/how-to-guides/row-redaction-tutorial.md): Build a policy that limits rows visible to users
- [Author a Time-Based Restriction Policy](https://documentation.immuta.com/SaaS/govern/secure-your-data/authoring-policies-in-secure/data-policies/how-to-guides/time-based-tutorial.md): Build a policy that returns data from a specified period of time
- [Policy Certifications and Diffs](https://documentation.immuta.com/SaaS/govern/secure-your-data/authoring-policies-in-secure/data-policies/how-to-guides/manage-policies-per-data-source.md): Create certifications for global policies, certify a policy, and view changes made to a data source's policy


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