you start power bi
step 1
new data source
import your excel file, google sheet, access table or whatever -- but only ONE THING
once its imported it is in power query
this is where you do your row formulas like you would in excel
so you imported a google sheet with order info -- maybe it contains 3 columns -- item_id, price, qty
using power query you add a new column named total = price * qty
then you use Load in power query to actually load the data into Power Bi
now repeat step 1 but for a different data item
maybe you import an excel file contains 4 columns -- state, city, population, year
you use power query to update each state and city to make sure it capitalized correctly "new mexico" is "New Mexico"
and each year is 4 digits not 2
and Load it into Power Bi
repeat step 1 for each data item
then in Power BI you join the data sources togethter in a star diagram
https://help.zebrabi.com/kb/power-bi/star-schema/
power bi will figure out which things are numbers and will get ready to sum them
so you drag a bar chart visualzation onto the canvas and then drag in our total field and our state field and power Bi will automatically create a sum of total for each state and make a bar for each state
the best thing to do is jsut search youtube for tutorials for what you're trying to do
Power Bi bar chart
https://www.youtube.com/results?search_q...+bar+chart
Power Bi tooltips
https://www.youtube.com/results?search_q...i+tooltips
you'll probably find 3 good videos and 50 garbage ones for every topic you search for
and the person who has a great video on one topic will have a bad video on a different topic
you jsut have to watch a little, try it out, practice, experiment and see what happens
what happens if I make a pie chart instead of a bar chart ? what happens if I change it to a matrix ? what the heck is a matrix anyway ? let me experiment and see what happens -- well that's interesting (or not)
that is the best way to learn this stuff