On the right side of the top ribbon, click on the page with a plus icon. Name the new page “all-lowercase-with-dashes” when it asks for page location. Title the page “With Capitals & Spaces”.
On the right side of top ribbon, click on the page with a pencil icon.
Headings are located on the toolbar ribbon, on the left side. It's a dropdown. It defaults to “Paragraph,” which is normal text. Heading 1 is used exclusively for the title at the top; the rest is up to you. The visual editor works similarly to Google Docs by using lots of the same shortcuts. Anything else you might need is on that toolbar ribbon.
Select the picture icon on the toolbar. Drag the desired assets into the top right corner and click 'Upload'. Then select the asset from the pane on the left and click insert at the bottom of that pane. Assets will insert where you are currently typing.
Visual editor. Top right option.