Of course, clicking on in a editable area, and typing is probably the easiest way to enter text. By default you enter the text as a paragraph. However, you can select the text and change the type of text to be a heading, list, or other type of text.
Often you will need to import text from other sources. This could come from another employee, a contractor, etc. Luckily you can import text from another source via a few different manners.
If you have text from other sources, and you can open the file, you can select the text you want to copy (CTRL-C / CMD-C) and paste it into a HTML document that you have open.
If you just Paste (CTRL-V/CMD-V), you copy your text, structure, and your formatting. If you Paste Special, then you can choose how to paste the text that you copied. When you choose Paste Special, a new window will appear with information on how you want to import.
Note that you will not import graphics, symbols, or shapes with the text.
The advantage of this method is that you can copy a little as a word or text, up to the entire document. If a client hands you everything (i.e. multiple pages of content) in a single document, this may be the easiest way to import the text from the new HTML document.
The other advantage of this method is that you can copy text from different types of text documents that you may not be able to import. This would include PDF, Write, other HTML documents, etc.
Import External Text File
You can import an entire file. Select File > Import > Word Document…
This will import the entire document and place the content where the cursor is. By default, structure, formatting, and text will be imported.
The semantic structure references the hierarchy as to how the content is laid out.
Normally you will want to have h1 tags define major headings. Generally, only one h1 tag should be on a given page, and define the general idea of the page. h2 tags provide sub-headings underneath that, h3 tags provide further division, etc.
Your main text should be in paragraph tags or lists.