[IMPROVE] change some wording

1-Introduction/03-defining-data/README.md

@@ -58,7 +58,7 @@ In this lesson we have learned:
 
 ## 🚀 Challenge
 
-Kaggle is an excellent source of open datasets. Use the [dataset search tool](https://www.kaggle.com/datasets) to find some data sets of interest and and classify 3-5 with this criteria:
+Kaggle is an excellent source of open datasets. Use the [dataset search tool](https://www.kaggle.com/datasets) to find some interesting datasets and classify 3-5 datasets with this criteria:
 
 - Is the data quantitative or qualitative?
 - Is the data structured, unstructured, or semi-structured?