Reformed Theology is often misrepresented in the “theological world” and is often spoken of in a negative way. More commonly this happens because someone had a bad experience with someone who is of the reformed theology camp or calls themselves a Calvinist.
Below I’ve linked to the introduction of a series Dr. R.C. Sproul did, explaining from a biblical perspective, what is reformed theology?
If you are interested in watching the rest of the series. You can view the videos on the Ligonier website.