Alternative Editors
Summernote
If you don't like the idea of typing code you can install what WonderCMS describes as the "awesome" Summernote editor. It's one of the official plug-ins available. With Summernote, you create your content much as you would when writing a letter in a word processor and you don't need to concern yourself with the code it generates.
Monaco
Besides Summernote there is a further editor, also available via an official plug-in, Monaco. Like the default editor, it is also a text editor, but one that has an "auto-complete" facility that prompts you with correctly formatted code for any HTML tag you might start typing. I discuss the pros and cons of both of these alternative editors on the pages linked above.
Related pages: Content and Style, Default Editor and External Editors.