Tips, Tricks, and Hints
Since, most likely, you'll be spending most of your time in Modx using the Text Editor, I thought it would be good to go through the most often used features, as well as some tips and tricks to make your Modx text editor experience more enjoyable.
Tip #1
When entering text into the editor, pressing the ENTER key on your keyboard will create a new paragraph. If you only want to move one line down, hold down SHIFT while pressing ENTER on your keyboard.
Tip #2
If you want to add in some text and style it using a bulleted list, numbered list, heading, or other styling attributes in the text editor, it is MUCH easier to add in all the text first, THEN go back and format each section of text as needed.
For example, if you are creating a bulleted list of names on a baseball team, type the baseball team name, then press ENTER on your keyboard, then type each player's name, hitting ENTER after each name. This will put each name in a separate paragraph. Now highlight the text of the baseball team name, and pull down the Paragraph menu (second row of icons at the end) 
and select a Heading. Then highlight all the player's names collectively, and click on the bulleted list icon 
.
Tip #3
Even though the text editor is called a WYSIWYG editor (What you see is what you get), this is not entirely true. If your website designer/developer did a good job of putting your site together, most of the styling (font color, font size, font type, line spacing, etc) will be taken care of automatically by an external styling sheet, so you don't have to do anything to make it look cohesive with the rest of your site. Just type it in and click SAVE.
Tip #4
If you ever need to access the actual HTML code of the content you are editing, just click the HTML icon 
and a window will pop up, giving you access to all the code. This is useful if you need to embed a YouTube video (using the embed code YouTube gives you) or embedding a Google Map or other widget on your website.