When editing - use the Preview button often - particularly if you can put the preview into a separate tab. This will quickly let you see which links work and don't work.
Consider using the WYSIWYG button instead of the Edit button. The WYSIWYG button brings up a "What You See is What You Get" editor. This will take a little bit of learning but some people may find it a better way to work. See WysiwygPlugin for details on this editor. Note does not work on Safari. Mac uses can use Mozilla.
If you attach images they can appear nicely within the page.
You can add quick commenting facilities to your pages. See CommentPlugin and the example below. Such comments will end up as bullet point entries on the page. .
this is an example comment. -- TonyFarrell - 05 Dec 2006 - 10:47
You can use the standard "Smilies" - such as , etc. See SmiliesPlugin
If you are adding tables, use the EditTablePlugin. An example appears below.
SpreadSheetPlugin plugins don't interact nicely - as the edit table plugin does not see the spreadsheet plugin contents, just the values and will put the wrong values into the table (the results of the spreadsheet table calculations rather then the formular.
Editable table example with summing row.