In this appendix, we will cover a few topics that cannot be placed in a recipe but that are important in order to make optimum use of Zabbix. We will show you some best practices when working with Zabbix and give you some hints on how to troubleshoot when you run into problems. Another important thing to know is how to upgrade your Zabbix installation and what are the problems that you may encounter. We will also see what is coming up in the next version of Zabbix and learn about communities you can seek help from to resolve any issues.