added table of content

- signed-off-by: trimstray <trimstray@gmail.com>

README.md

@@ -11,6 +11,8 @@
 
 <p align="center">"<i>Did you know all your doors were locked?</i>" - Riddick (The Chronicles of Riddick)</p>
 
+<br>
+
 <p align="center">
   <a href="https://github.com/trimstray/the-practical-linux-hardening-guide/tree/master">
     <img src="https://img.shields.io/badge/Branch-master-green.svg?longCache=true"
@@ -32,6 +34,79 @@
 
 <br>
 
+:collision: Work in progress, just a moment... First, I update a [Table Of Content](#table-of-content).
+
 ****
 
-Work in progress, just a moment...
+## Table Of Content
+
+- [Checklist - document the host information](#checklist-document-the-host-information)
+- [Pre install tasks](#pre-install-tasks)
+  * [Physical system security](#physical-system-security)
+    + [BIOS protection](#bios-protection)
+  * [Partitioning scheme](#partitioning-scheme)
+  * [Hard disk encryption](#hard-disk-encryption)
+  * [Bootloader configuration](#bootloader-configuration)
+- [Post install tasks](#post-install-tasks)
+  * [Keep system updated](#keep-system-updated)
+  * [Package management](#package-management)
+    + [Remove packages with known issues](#remove-packages-with-known-issues)
+  * [Netfilter ruleset](#netfilter-ruleset)
+  * [TCP wrapper](#tcp-wrapper)
+  * [Users and groups](#users-and-groups)
+    + [Limit su access](#limit-su-access)
+    + [Disable root account](#disable-root-account)
+    + [Logins to system console](#logins-to-system-console)
+    + [Disable shell accounts](#disable-shell-accounts)
+    + [Strong password policy](#strong-password-policy)
+    + [Password aging](#password-aging)
+    + [Previous passwords](#previous-passwords)
+    + [Login failures](#login-failures)
+  * [System path permissions](#system-path-permissions)
+    + [World writable files](#world-writable-files)
+  * [Disk partitions](#disk-partitions)
+    + [Secure /tmp and /var/tmp](#secure-tmp-and-var-tmp)
+    + [Disk quotas](#disk-quotas)
+  * [PAM module](#pam-module)
+  * [Limits](#limits)
+  * [Shadow passwords](#shadow-passwords)
+  * [Linux kernel hardening](#linux-kernel-hardening)
+  * [Kernel parameters](#kernel-parameters)
+    + [Improve network security](#improve-network-security)
+    + [Improve system security](#improve-system-security)
+  * [Remove unused modules](#remove-unused-modules)
+  * [Secure shared memory](#secure-shared-memory)
+  * [IRQ balance](#irq-balance)
+  * [Disable compilers](#disable-compilers)
+  * [Email notifications](#email-notifications)
+  * [Backups](#backups)
+- [Tools](#tools)
+  * [Logging and Auditing](#logging-and-auditing)
+    + [Auditd](#auditd)
+    + [Tiger](#tiger)
+    + [Aide](#aide)
+    + [Logwatch](#logwatch)
+  * [Other](#other)
+    + [Fail2ban](#fail2ban)
+    + [PSAD](#psad)
+    + [SELinux](#selinux)
+    + [Centralized authentication service](#centralized-authentication-service)
+  * [Testing tools](#testing-tools)
+    + [Lynis](#lynis)
+    + [Chrootkit](#chrootkit)
+- [Hardening Services](#hardening-services)
+  * [Disable all unnecessary](#disable-all-unnecessary)
+  * [System services](#system-services)
+    + [OpenSSH](#openssh)
+    + [NTP](#ntp)
+    + [Cron](#cron)
+    + [Anacron](#anacron)
+  * [DNS services](#dns-services)
+    + [Bind9](#bind9)
+  * [Mail services](#mail-services)
+    + [Postfix](#postfix)
+  * [Web services](#web-services)
+    + [Nginx](#nginx)
+    + [Apache](#apache)
+- [Testing configuration](#testing-configuration)
+- [External resources](#external-resources)