There are at least three different Telugu serials with similar names. Ensure you are looking for the correct one (usually the one starring as Lord Shiva or Actor Arjun in later versions). Check the thumbnail.
ETV Telugu's official website may have episodes of the serial available for streaming. However, due to copyright restrictions, it's unlikely that all episodes are freely accessible. hara hara mahadeva telugu serial all episodes free
You're looking for information on the Telugu serial "Hara Hara Mahadeva" and wanting to know about its features and possibly watch all episodes for free. There are at least three different Telugu serials