Nearly all modern document processors are based on “styles” or equivalent concept. Even if they offer a “direct formatting” (= no style) alternative, this alternative is just worth for quick’n’dirty experimenting to see the effect of such and such feature or setting. Anyway, styles are always present in the background and direct formatting interact with them nolens volens (Latin expression for “either you want or not”).
So, your best approach is to learn styles, at least to know how your direct formatting will impact the result. Note that styles offer you much more power than direct formatting and a tremendous comfort when it comes to appearance tuning.
For a very superficial introduction to styles, read the Writer Guide. What is not stated in this guide is: styles are not shortcuts for a collection of typographical attributes; they are an integral part of author’s job as they are used to markup the semantic value of paragraphs, words, pages or any other objects. Consequently, you don’t name them “bold”, “italics”, “red” but Heading n for chapter titles, “commentary”, Emphasis, Strong Emphasis, “important”, … Then you give these styles typographical attributes. You may have Emphasis and “quotation” end up visually the same as italics but the corresponding text are distinctively marked up, which means you can reliably change “quotation” for bold blue instead of italics without even the need to check you have no false change.
This is more professional. You may find it “heavy” in the beginning while you learn how to use it but soon you’ll find it an invaluable tool and a real boosting method of typing documents.