If you are installing from a zip file then by default there will be an install root directory of keycloak-26.0.5, which can be created anywhere you choose on your filesystem.
/opt/keycloak is the root install location for the server in all containerized usage shown for Keycloak including Running Keycloak in a container, Docker, Podman, Kubernetes, and OpenShift.
In the rest of the documentation, relative paths are understood to be relative to the install root - for example, conf/file.xml means <install root>/conf/file.xml
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Under the Keycloak install root there exists a number of folders:
bin/ - contains all the shell scripts for the server, including kc.sh|bat, kcadm.sh|bat, and kcreg.sh|bat
client/ - used internally
conf/ - directory used for configuration files, including keycloak.conf - see Configuring Keycloak. Many options for specifying a configuration file expect paths relative to this directory.
truststores/ - default path used by the truststore-paths option - see Configuring trusted certificates
data/ - directory for the server to store runtime information, such as transaction logs
logs/ - default directory for file logging - see Configuring logging
lib/ - used internally
providers/ - directory for user provided dependencies - see Configuring providers for extending the server and Configuring the database for an example of add a JDBC driver.
themes/ - directory for customizations to the Admin Console - see Developing Themes