Let's get necrotic up in here! I am a lover of the Necromancer profession, especially their undead minions. Hope you find this useful for open world content.
The vast majority of heal builds in Guild Wars 2 are expected to also function as boon supports, and this is no different for Heal Mechanist. Heal Mechanist has a distinct advantage over the other builds in this role, in that a significant amount of its support happens automatically as long as the Mech is on the group.
At least I can say that the guild wars 2 wiki is good and can be accesed from the chat in-game. i have been playing mmos for 2 decades, and it is NOT normal to rely on outside souces to play. 1000s of hours in wow, swtor, tera, aion, FF etc. stop spreading misinformation like that.
New player also - not very informed opinion, but from my perspective - I would definitely spend my first gems on inventory slots, the gathering tools that don't expire, teleport to a friend and overall QoL stuff. I would save what's left for cosmetics I like. imo the best Qol item for beginner is a lounge pass for Mistlock Sanctuary ( https
Edited to add: Master of monuments is intimidating but really easy. Run up, claim a monument and run away. People are normally not the best at thinking ahead. They try to claim the shrine you took rather than intercept you at a future shrine (especially if they're only one person and can't predict your movement). .