Read the following articles for more information:
- Zabbix server: https://zabbix.com/documentation/4.0/manual/appendix/config/zabbix_server
- Zabbix agent (Unix): https://zabbix.com/documentation/4.0/manual/appendix/config/zabbix_agentd
- Appendixes: https://zabbix.com/documentation/4.0/manual/appendix