Use SUM function to quickly calculate the sum

Use IF function to judge data

A quick way to calculate sum, average, count, max, and min

Use Date function to convert date format

AVERAGE function quickly average data

Use COUNTIF function for conditional statistics

Use the DATEDIF function to calculate the intervals of dates

Use the Today function to quickly calculate days between dates

Use COUNT function to count the number of cells with parameters

SUBTOTAL function: Calculate the data with the hidden value

TEXT formula in WPS Spreadsheet

Use the ROUND function to round decimals quickly 

Use SUMIFS function with multiple criteria

COUNTIFS function: count data of multiple criteria

Look up data quickly with LOOKUP function

How to use the FILTER Function