Guild Wars 2

Hey folks, have gotten busy recently but have leveled guardian engineer and warrior to 20 and would like more information before I commit further. My buddy is a necromancer and we were wondering what professions excel/synergize well to make dungeons and high-end pve content a better experience. From what I’ve seen it seems like guardians are the class that aggros/ “tanks” the mobs making them somewhat valuable? What professions are “preferred” for dungeon content or what professions are sorely needed for better runs. Thanks for opinions and I apologize if this question is nubbish, but I am having trouble commiting to a class.

Hey folks just began playing the game and was hoping for some input on what class to play. I’ve always enjoyed being the healer in mmos as it was often the most needed. What profession do people tend to look for in dungeon content. What is underplayed but necessary? My brother is rolling a necromancer and I would like to know if any professions synergize well with his. Would appreciate any input, Thanks.