the youtube channels: Curbal, Guy in a Cube, MyOnlineTrainingHub, ExcelIsFun
If the queries you run are big/lots of data, look into sql optimization/query optimization.
Your ERP should have come with a running reports utility. if not, probably MS SSRS or SAP Crystal Reports. Look at the youtube tutorials.
Hopefully, they deployed with adequate hardware. Also thinking for 5 years growth of data. I had to deal with really old hardware, badly designed ERP and crazy connection drivers.
And to top it off, people that think Excel is the ultimate utility (for pulling lots of data)