How to configure a fixed ip address using DHCP in Linux

We start with an installed isc-dhcp-server in Linux and an empty configuration file. Lease time and server options are configured using standard configuration. A range for the server is created. Finally, a fixed host address is configured and tested

Server: Linux Debian version 9 / stretch
DHCP Software: isc-dhcp-server 4.3.5

Client: Linux Debian version 9 / stretch