Use Trinket Slot Macro
This will use the trinket in slot Z, unless you click button 2, in which case it will equip the trinket at bag coordinates X,Y. Useful for engineers with multiple trinkets on separate cooldowns (i.e. Goblin Mortar and Goblin Dragon Gun in slot 13, Goblin Bomb Dispenser and Mithril Mechanical Dragonling in slot 14). Left click a trinket in the menu to equip it to the top trinket slot. Right click a trinket in the menu to equip it to the bottom trinket slot. Left or Right click either trinket to use them. Or make a key binding for either trinket. Note: Key bindings to use equipped trinkets are fairly slower than actionbars, better create macros for each.
For your Interface I would recommend using Weakauras and Bigwigs.
Weakauras will give you the opportunity to import a lot of helpful stuff to keep track of your cooldowns, buffs and debuffs.
BigWigs for having a boss mod helping you out to plan our cooldowns ahead of time and be prepared for certain abilities that are about to happen.
Use Trinket Slot Macro
Macros
Here are some useful Hunter macros everyone should have:
Use Trinket Slot Macro Keys
Trueshot, Trinket & Berserking Macro
If you have a trinket which cooldown lines up perfectly with trueshot, you use both at the same time. This just gives an extra action bar slot for anything you want. In case the trinket is out of cd and trueshot is not, you just press the macro to use the trinket.
Resonation Arrow Macro
This is for any spell that has a target reticle such as traps, flare and binding shot.
Aspect of the Turtle Cancel Aura
You're unable to cast spells while being in Aspect of the Turtle so it might be useful to cancel it sometimes.
Misdirection Mouseover or Focus Macro
Misdirection is an important ability in Dungeons but also in Raids: This macro will cast Misdirection on the target you are currently mousing over. Otherwise, it will cast on your Focus target.
IT'S IMPORTANT FOR BM HUNTERS TO USE THIS MACRO FOR EVERY OFFENSIVE SPELL
The auto-cast system in the game is super slow on pets and you might miss out make sure to use this macro.
Another important topic is the pet attacks, you should macro them into all of your abilities when you're using a pet to guarantee the pet will use them on cooldown and not miss out on damage.
Here is one example for Barbed Shot. It is recommended to macro these into every important ability while using a pet.
Some auras that I find really useful are the buff trackers, such as for Trueshot, Precise Shots, Posthaste. If you are hiding your action bars as I do, Aimed Shot stacks and any cooldown tracker is also really good.
Apart from class/spec specific WA you can also track Combat Meditation and Let Go of the Past.
Afenar does some really good WA so you can check him out at https://wago.io/p/Afenar or you can find a wide selection of Hunter auras at https://wago.io/shadowlands-weakauras/classes/hunter.