Add web parts
When you add a modern page to a site, you add and customize web parts, which are the building blocks of your page.
Add a web part (with the content pane)
Go to the page where you want to add a web part.
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At the top of the Toolbox
on the right, you will see a curated list of web parts to choose from.
Toolbox
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To view all web parts, select See all web parts. Easily find what you're looking for by typing in the Search box, then select or click-and-drag the web part onto the canvas.

Search All Webparts
Click
for a list view or
for a grid view. You can also sort the web parts and filter them by category from the drop-down list.
Grid View