diff --git a/README.md b/README.md
index 4b49601..aa8e588 100644
--- a/README.md
+++ b/README.md
@@ -858,6 +858,7 @@ performance of any of your sites from across the globe.<br>
 &nbsp;&nbsp;:small_orange_diamond: <a href="http://www.omnisecu.com/index.php"><b>Omnisecu</b></a> - free Networking, System Administration and Security tutorials.<br>
 &nbsp;&nbsp;:small_orange_diamond: <a href="https://github.com/cirosantilli/linux-cheat"><b>linux-cheat</b></a> - Linux tutorials and cheatsheets. Minimal examples. Mostly user-land CLI utilities.<br>
 &nbsp;&nbsp;:small_orange_diamond: <a href="http://cb.vu/unixtoolbox.xhtml"><b>Unix Toolbox</b></a> - collection of Unix/Linux/BSD commands and tasks which are useful for IT work or for advanced users.<br>
+&nbsp;&nbsp;:small_orange_diamond: <a href="https://peteris.rocks/blog/htop/"><b>htop explained</b></a> - explanation of everything you can see in htop/top on Linux.<br>
 &nbsp;&nbsp;:small_orange_diamond: <a href="https://linuxguideandhints.com/"><b>Linux Guide and Hints</b></a> - tutorials on system administration in Fedora and CentOS.<br>
 &nbsp;&nbsp;:small_orange_diamond: <a href="https://github.com/NanXiao/strace-little-book"><b>strace-little-book</b></a> - a little book which introduces strace.<br>
 &nbsp;&nbsp;:small_orange_diamond: <a href="https://github.com/bagder/http2-explained"><b>http2-explained</b></a> - a detailed document explaining and documenting HTTP/2.<br>
@@ -867,6 +868,7 @@ performance of any of your sites from across the globe.<br>
 &nbsp;&nbsp;:small_orange_diamond: <a href="https://github.com/trimstray/nginx-admins-handbook"><b>Nginx Admin's Handbook</b></a> - describes how to improve NGINX performance, security and other important things.<br>
 &nbsp;&nbsp;:small_orange_diamond: <a href="https://github.com/digitalocean/nginxconfig.io"><b>nginxconfig.io</b></a> - NGINX config generator on steroids.<br>
 &nbsp;&nbsp;:small_orange_diamond: <a href="https://infosec.mozilla.org/guidelines/openssh"><b>openssh guideline</b></a> - is to help operational teams with the configuration of OpenSSH server and client.<br>
+&nbsp;&nbsp;:small_orange_diamond: <a href="https://gravitational.com/blog/ssh-handshake-explained/"><b>SSH Handshake Explained</b></a> - is a relatively brief description of the SSH handshake.<br>
 &nbsp;&nbsp;:small_orange_diamond: <a href="https://packetlife.net/"><b>PacketLife.net</b></a> - a place to record notes while studying for Cisco's CCNP certification.<br>
 </p>
 
@@ -972,6 +974,7 @@ performance of any of your sites from across the globe.<br>
 &nbsp;&nbsp;:small_orange_diamond: <a href="https://open.buffer.com/5-whys-process/"><b>Five Whys</b></a> - you know what the problem is, but you cannot solve it?<br>
 &nbsp;&nbsp;:small_orange_diamond: <a href="https://howhttps.works/"><b>howhttps.works</b></a> - how HTTPS works ...in a comic!<br>
 &nbsp;&nbsp;:small_orange_diamond: <a href="https://howdns.works/"><b>howdns.works</b></a> - a fun and colorful explanation of how DNS works.<br>
+&nbsp;&nbsp;:small_orange_diamond: <a href="https://postgresqlco.nf/en/doc/param/"><b>POSTGRESQLCO.NF</b></a> - your postgresql.conf documentation and recommendations.<br>
 </p>
 
 #### Inspiring Lists &nbsp;[<sup>[TOC]</sup>](#anger-table-of-contents)
@@ -991,8 +994,7 @@ performance of any of your sites from across the globe.<br>
 &nbsp;&nbsp;:small_orange_diamond: <a href="https://wiki.archlinux.org/index.php/List_of_applications"><b>List of applications</b></a> - huge collection of applications sorted by category, as a reference for those looking for packages.<br>
 &nbsp;&nbsp;:small_orange_diamond: <a href="https://github.com/InterviewMap/CS-Interview-Knowledge-Map"><b>CS-Interview-Knowledge-Map</b></a> - build the best interview map.<br>
 &nbsp;&nbsp;:small_orange_diamond: <a href="https://github.com/Tikam02/DevOps-Guide"><b>DevOps-Guide</b></a> - DevOps Guide from basic to advanced with Interview Questions and Notes.<br>
-&nbsp;&nbsp;:small_orange_diamond: <a href="https://github.com/bregman-arie/devops-interview-questions"><b>devops-interview-questions</b></a> - contains interview questions on various DevOps and SRE related topics.<br>
-</p>
+&nbsp;&nbsp;:small_orange_diamond: <a href="https://github.com/bregman-arie/devops-interview-questions"><b>devops-interview-questions</b></a> - contains interview questions on various DevOps and SRE related topics.<br></p>
 
 ##### :black_small_square: Developers