When pasting text from elsewhere choose NOT to include formatting. This brings all kinds of rubbish code with it that is useless until it breaks something.
Add a link to a page by selecting text and choosing link icon. Choose destination Page from list presented. External links open in a new window.
Upload files for download to the relevant folder in Media i.e. EBC/Vocational/downloads. Create link as above but choose Media instead of internal Page.
If you realise you want an object (a block, a button, other) that can be shared across multiple pages, let me know.
When you are ready to look at units, click here.
You need to edit source <> icon in panel above.