first you will need to index the data, read here:
https://docs.splunk.com/Documentation/Splunk/7.2.4/Data/Getstartedwithgettingdatain
then start and search the data:
https://docs.splunk.com/Documentation/Splunk/7.2.4/Search/GetstartedwithSearch
then enjoy the visualizations and dashboard:
https://docs.splunk.com/Documentation/Splunk/7.2.4/Viz/CreateDashboards
plenty of reading, lots of fun
you can practice also with the search tutorial, it covers plenty of the above with hands on work:
https://docs.splunk.com/Documentation/SplunkCloud/7.2.3/SearchTutorial/WelcometotheSearchTutorial
hope it helps
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