The article below is just a basic introduction to the topic. For something more advanced, written by pros and a fantastic leveling guide, my recommendation would be this Elder Scrolls Online Leveling Guide. I could not find any other guide that comes even close in terms of the impact it had on me.
Due to a political marriage established between Emeric, the Redguards now loyally serve under him and his causes. Working with the Orcs and Bretons, the Daggerfall Covenant is a very solid Alliance containing the best warriors throughout Tamriel.
Redguards are originally from the region of Hammerfell. Being extremely athletic warriors, they prize honor and dignity above anything else. Young Redguard warriors endure a rite of passage to determine which warriors are capable of surviving in the Alik’r Desert. They are tough, like the Orcs but they are driven to prove themselves as capable, agile warriors with a deep sense of history guiding them.