There are a few different ways that you can use multiple test conditions in Excel. One way is to use the IF function. The IF function takes three arguments: the first is the condition that you want to test, the second is what should happen if the condition is met, and the third is what should happen if the condition is not met. You can have as many IF functions nested inside of each other as you want, which allows you to test multiple conditions. Another way to use multiple test conditions is with COUNTIF. COUNTIF can only test one condition at a time, but it can test for multiple conditions by using the OR operator. For example, if you wanted to count how many cells in a range contained either the word "red" or the word "blue", you would use the following formula:
=COUNTIF(range,"red")+COUNTIF(range,"blue"). You can also use wildcards with COUNTIF, which allows you to test for partial matches. For example, if you wanted to count how many cells in a range contained the letters "red" (in any order), you would use the following formula:
=COUNTIF(range,"*red*"). There are other ways to use multiple test conditions in Excel as well, but these are two of the most common.