Note: This answer applies to Splunk Enterprise and Splunk Cloud.
It's a best practice to start your Splunk learning by reading the Splunk Enterprise Overview manual in Splunk Docs. Then, you'll be well positioned to attend the Splunk Weekly Web Demo. This video provides a 30-minute overview and demo about how Splunk Enterprise turns machine data into operational intelligence. It briefly defines machine data and describes how businesses use Splunk to support IT operations, application delivery, security, compliance, business analytics, IoT, and Industrial data.
The Splunk Community portal and Support and Services contain dashboards that link to sites with community resources, training, and Splunk events. As we move along this journey, you'll find the following resources useful time and time again: