What famous chess games are recommended to study for beginners?

There are alot of chess games that Grandmasters and other people study in order to improve at chess Especially with the notable game of Paul Morphy 'The Opera Game' 

However besides the 'Opera Game' are there anymore chess openings that one can study to improve specifically 600-1000 elo?

I would not study grandmaster games at an elo under 1500, because you probably won't understand what they are doing meaning you won't learn anything. Some chess openings I would study at your level are king/queen gambit, Italian, and beginner gambits like Blackburn-shilling and Englund gambit.

The openings of GM games very useful for demonstrating the importance of prophylactic moves during the opening which is something I used to be cavalier about.

I would recommend to study the games in the following games collection books (in the following order). Be sure to check out the reader reviews...

A First Book of Morphy by Frisco Del Rosario...

Logical Chess Move By Move by Irving Chernev...

Both books follow the same formula. That is, to explain the chess principles, strategies and reasoning behind each move. The games are chosen for their instructive value. The books are outstanding for their intended purpose and are targeted to the improving chess amateur, primarily the beginner-novice player.

As for openings, I suggest to check out some of the resources in the following article....

Chess Openings Resources for Beginners and Beyond…

https://www.chess.com/blog/RussBell/openings-resources-for-beginners-and-beyond

You might also check out....

Games every chess player should know...

https://www.bing.com/search?q=games%20every%20chess%20player%20should%20know&qs=n&form=QBRE&sp=-1&lq=0&pq=games%20every%20chess%20player%20should%20know&sc=12-36&sk=&cvid=CD028B9C67D64CD494E2079CA7E7AC53&ghsh=0&ghacc=0&ghpl=

This is the most recent edition (2021) of this well-known games collection. The book's title says it all. Note the five "authors" - So, Adams, Burgess, Nunn, and Emms (the last three being the authors of the original 1998 and subsequent editions prior to this 2021 expanded edition), The book contains 145 games presented in chronological order. Every game is annotated, with a background note relevant to the game under consideration and the players. Note also Judit Polgar and Magnus Carlsen on the cover - two of the greatest chess players of the modern era...

The Mammoth Book of the World Greatest Chess Games...(2021 edition)...

https://www.amazon.com/Mammoth-Worlds-Greatest-Chess-Games/dp/1472146220

ISBN: 9781472146229