Update README.md

Author: leftrightleft

README.md

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 # Advanced Security Material
-A place for resources to help you understand and use GitHub Advanced Security
+A place for resources to help you understand and use GitHub Advanced Security (GHAS).  Browse the directories in this repository for resources and documentation.  To help you get started with GHAS, we've provided some introductory documentation in this file.
+
+## Get started
+The following list of links are great resources to get you started on learning how to use, deploy, and manage GitHub Advanced Security in your environment.
+
+New to GitHub Advanced Security?  Start with [GitHub security features](https://docs.github.com/en/enterprise-cloud@latest/code-security/getting-started/github-security-features) :+1:
+
+## Code Scanning
+- [About GitHub Code Scanning](https://docs.github.com/en/code-security/code-scanning/automatically-scanning-your-code-for-vulnerabilities-and-errors/about-code-scanning)
+- [Configuring Code Scanning](https://docs.github.com/en/enterprise-cloud@latest/code-security/code-scanning/automatically-scanning-your-code-for-vulnerabilities-and-errors/configuring-code-scanning)
+- [Integrating other tools with GHAS](https://docs.github.com/en/code-security/code-scanning/integrating-with-code-scanning)
+
+## CodeQL
+- [Meet CodeQL](https://codeql.github.com/)
+- [CodeQL Documentation](https://codeql.github.com/docs/)
+- [CWE Query Mapping Documentation](https://codeql.github.com/codeql-query-help/codeql-cwe-coverage)
+- [Running additional queries](https://docs.github.com/en/github/finding-security-vulnerabilities-and-errors-in-your-code/configuring-code-scanning#running-additional-queries)
+- [CodeQL CLI Docs](https://codeql.github.com/docs/codeql-cli/getting-started-with-the-codeql-cli)
+- [Running CodeQL in your CI System](https://docs.github.com/en/github/finding-security-vulnerabilities-and-errors-in-your-code/running-codeql-code-scanning-in-your-ci-system)
+
+## Secret Scanning
+- [About Secret Scanning](https://docs.github.com/en/code-security/secret-scanning/about-secret-scanning)
+- [Supported secret patterns](https://docs.github.com/en/code-security/secret-scanning/secret-scanning-patterns#supported-secrets-for-partner-patterns)
+- [Defining custom secret patterns](https://docs.github.com/en/enterprise-cloud@latest/code-security/secret-scanning/defining-custom-patterns-for-secret-scanning)
+
+## Supply Chain Security (Dependabot)
+- [About](https://docs.github.com/en/enterprise-cloud@latest/code-security/supply-chain-security/understanding-your-software-supply-chain/about-supply-chain-security)
+- [Dependency Graph](https://docs.github.com/en/enterprise-cloud@latest/code-security/supply-chain-security/understanding-your-software-supply-chain/about-the-dependency-graph)
+- [Dependabot Alerts](https://docs.github.com/en/enterprise-cloud@latest/code-security/dependabot/dependabot-alerts/about-dependabot-alerts)
+- [Dependabot Security Updates](https://docs.github.com/en/code-security/dependabot/dependabot-security-updates/configuring-dependabot-security-updates)
+- [GitHub Advisory Database](https://github.com/advisories)
+
+## Security Overview
+- [About Security Overview](https://docs.github.com/en/code-security/security-overview/about-the-security-overview)
+- [Managing alerts in your repository](https://docs.github.com/en/enterprise-cloud@latest/code-security/code-scanning/automatically-scanning-your-code-for-vulnerabilities-and-errors/managing-code-scanning-alerts-for-your-repository)
+
+## Other Resources
+- [SARIF Tutorials](https://github.com/microsoft/sarif-tutorials)
+- [GitHub Advanced Security Learning Path](https://docs.microsoft.com/en-us/users/githubtraining/collections/rqymc6yw8q5rey)
+- [Scaling GHAS in Your Organization](https://resources.github.com/downloads/Whitepaper-Scaling-GHAS-in-an-Enterprise.pdf)
+- [The Complete Guide to Developer-first Security](https://resources.github.com/downloads/GitHubAdvanced%20SecurityEbook.pdf)
+- [GitHub Checkout - Code Scanning (video)](https://www.youtube.com/watch?v=z0wvGf3O69E)
+- [GitHub Checkout - Secret Scanning (video)](https://www.youtube.com/watch?v=aoL7pDrXt74)
+- [GitHub Checkout - Viewing and Managing your Dependencies (video)](https://www.youtube.com/watch?v=gNd_TGdZ1xc)