Once you learn about Snowplow's canonical event model (https://github.com/snowplow/snowplow/wiki/Canonical-event-model https://github.com/snowplow/snowplow/wiki

Once you learn about Snowplow's canonical event model (https://github.com/snowplow/snowplow/wiki/Canonical-event-model https://github.com/snowplow/snowplow/wiki/Canonical-event-mo...) or read Keen's data modeling guide (https://keen.io/docs/event-data-modeling/event-data-intro/ https://keen.io/docs/event-data-modeling/event-data-intro/) you quickly realize all the stuff that you haven't been recording :)