This is a beginners guide too
I found Many anime fans don't know the difference between this anime types specifically beginners!

1. TV

Anime made for television, usually released in episodes.

Example: Naruto, Re:Zero, Frieren
What to expect: The main series, usually with multiple episodes.

2. MOVIE

A full-length anime film, usually designed to tell a story in one sitting.

Example: Your Name, A Silent Voice
What to expect: Usually around 1–2 hours, with a complete story or a continuation of a series.

3. OVA

Original Video Animation. Originally released directly for home video rather than first airing on TV or in cinemas.

Example: Attack on Titan: No Regrets OVA
What to expect: Bonus episodes, side stories, or sometimes an entire standalone series. Some are important to the main story.

4. ONA

Original Net Animation. Anime that originally premieres online, such as on a streaming platform.

Example: The Way of the Househusband
What to expect: It can be a full series, a short episode, or even a movie. It isn't necessarily short.

5. Special

An extra anime episode or production released outside the regular episode schedule.

Example: A Christmas episode, a bonus romance episode, or a recap special.
What to expect: Extra character moments, comedy, side stories, or a recap. Some specials are important, so check the description before skipping.

6. Music

An animated video created around a song or musical performance.

Example: Shelter by Porter Robinson and Madeon.
What to expect: Music with animation, sometimes telling a complete story in just a few minutes.

7. TV Short

Anime made for television with episodes shorter than 15 minutes.

Example: Isekai Quartet
What to expect: Quick comedy, short stories, or mini-episodes rather than standard-length episodes.