Clear the cache when you make changes
Be very careful when pasting from a word-processor or another web-page
Although it may not be clear when you copy or paste it, there may be hidden code included with whatever you copy which can have adverse effects on the page that is displayed. So please use the “paste as text” button 
before pasting , or after pasting select the pasted text and use the “clear formatting” button 
.
Use headings and pre-defined styles for formatting where possible
It helps to keep styling consistent, and helps Google to index your site.
For example, if you want a heading please use the formatting toolbar’s dropdown (see image right) and select “Heading 2” (Heading 1 will automatically be used for the page’s title).