Below is a video on how to use all of the icons on the Insert Ribbon. If you scroll down below the video, you can get clickable quick access to each of the icon explanations in the video shown below.

0:00 Insert Icon

0:03 Pivot Table

5:40 Pivot Charts

6:03 Pivot Table Analysis

6:40 Design Icons

7:53 Illustrations Icon

8:44 Recommended Charts

10:11 3-D Maps

13:35 Sparklines

14:28 Link Icon

15:23 Comment Icon

15:48 Text Icon

16:05 Symbol Icon