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.
Another member from the Ebonheart Pact is the Dunmer or Dark Elves.
The Dunmer, through history contains conflicts with the Nords. Morrowind, their home land through history is invaded by the Nords, the constant invasion transformed the Dunmer to be paranoid about any possible future invasions. Thus, through invasions, the Dunmer’s paranoia allowed the race to strengthen their defenses while some turn out to be excellent diplomats. They don’t like to be up in arms often due to their history of political invasion the Dunmers over time hardened to be skillful warriors.
They contain a natural affinity for magic propelling them to be one of Tamriel’s leading sorcerers.
Hostilities are likely to rise between the Nords and Argonians as all three races share a deep history based on mistrust.