According to the Tauren lore, Cenarius instructed them first in Druidism, as recounted in their myth Forestlord and the First Druids. It was in fact Malfurion Stormrage who was the first mortal druid, and Cenarius's greatest student. It is likely, however, that Cenarius may have met and befriended the Tauren.
He would lead the night elves through the War of the Ancients and the long years that followed. With the creation of the World Tree Nordrassil, the kaldorei druids were bound to Ysera, and her realm, the Emerald Dream, in which they spent centuries of their immortal lives. The Cenarion Circle was formed as the governing society of druids, based in the sacred Moonglade.
Locked in slumber in their barrow dens for generations, the druids awoke to meet the threat of the Burning Legion during its recent invasion. After Archimonde's defeat, the druids chose to remain in the waking world and help to rebuild their shattered lands. The Legion's attack left a terrible scar on the natural order, and the druids seek to heal it.
The night elf druids were recently joined in the Cenarion Circle by the Tauren. During the war, Malfurion had befriended Hamuul Runetotem and taught him of druidism. Hamuul later became the first tauren to join the Cenarion Circle and later the archdruid of the Tauren race.
Cenarius is the patron entity of all druids. However, each group of druids has its own special patrons and some even have the ability to transform into a being that looks like their patron. Many druids will take on an animal companion based on their patron.
Druids belong to many different organizations including the Cenarion Circle, Cenarion Expedition, Druids of the Claw, Druids of the Talon, Druids of the Wild, Druids of the Fang, Druids of the Antler, Druids of the Grove, and Fandral Staghelm.
The first druid tip is for the player of a druid character to know how to fill the 2 main roles that are expected of the class in the game. Being a DPS spell caster is not as important to the druid, as warlocks and mages have higher DPS ratings, and although 2 other classes are available to tank and 3 other classes can heal, competition for the spots is not as intense as that for the DPS slots in a group and many groups will disband for lack of either.
Depending on how the druid chooses to spend his talent points, he may fill one role better than another but a druid who can heal and tank will be able to fill 2 vital group roles.
The second druid tip is to use the variety of the class to keep a character’s interest in the class. The Druid may be a jack-of-all-trades and usually master of only one, but it appeals to players who easily become bored with a single play style. Using this druid tip to its full effectiveness in World of Warcraft will help keep it interesting for the player.
The third druid tip is for characters to learn how to manage mana in their night elf or tauren forms. The bear form gains rage and the cat form uses energy. Managing mana will help the druid fulfill the role of healer of DPS caster. More often than not the druid will be called upon to be a backup healer if he is not restoration specialization, but the moonkin form in the balance tree puts the druid slightly below the mage and warlock in DPS capabilities.
It is not possible to do a comprehensive list of druid tips here that would cover every situation. The World of Warcraft forums maintained by Blizzard and the unofficial World of Warcraft forums are good places for players to pose questions and get advice on their specific classes.