Openings?

As a beginner you need to follow opening principles. So to develop as fast as you can , control the center, bring out minor pieces, castle and connect your rooks.
Here is all of that in detail... most of what you need to know about opening phase as a beginner:
https://www.chess.com/blog/nklristic/surviving-the-opening-first-steps-to-chess-improvement

Chess Openings Resources for Beginners and Beyond...
https://www.chess.com/blog/RussBell/openings-resources-for-beginners-and-beyond
https://www.chess.com/blog/RussBell