Aggregation, selector, ... tutorials and/or examples

I made a search about this subject but without success.
Is there detailed information (tutorial, URL, …) or commented examples on how works - as exactly as possible - the different aggregation, selector and so on (all possibilities in graph select query) ?
We use InfluxDB + Grafana, last version.
Thanks in advance
Best regards,

There is the official influxdb docs detailing the query language and functions, not sure what more there is

Thanks for answer.
I searched in Grafana doculentation. It is in InfkuxDB (
Now i have to read for my vacation, thanks :wink:
best regards,