I’m creating this guide to Sylvanas for players who aren’t very experienced in the game or are new to Sylvanas. The reason for this is I want to help players that want to learn Sylvanas but need a starting point/build. This topic will be just that. I will try to make this as brief as possible. That being said, lets jump right in.
First things first, let’s go over Sylvanas’s kit.
Trait (D) Black Arrows - Activate to stun minions, mercenaries (non-elite), and structures. All basic attacks mark heroes up to 3 times. At 3 stacks, enemies take 25% more damage from Sylvanas
Withering fire (Q) - Shoots enemies with up to 5 arrows that deal damage (prioritizing heroes). Cooldown resets on takedowns.
Shadow Dagger (W) - Throws a dagger to an enemy. By dealing damage to that target, the damage spreads to all other enemies within a certain range. (Even spreads activatable trait, if active)
Haunting Wave (E) - Launches a wave of banshees to a target area damaging all in path (also spreads activatable trait, if active). Press E again to teleport to her banshees. (her main method of escape)
Build
Sylvanas has a few viable builds but this first one is the best for starter Sylvanas’s. Its very safe and as long as you know how to auto attack, you should do fine. (QM results may vary)
Level 1 - Might of the Banshee Queen
Level 4 - Mercenary Queen or Unstable Poison
Level 7 - Barbed Shot or Lost Soul
Level 10 - Wailing Arrow or Mind Control
Level 13 - Remorseless
Level 16 - Life Drain
Level 20 - Withering Barrage or Bolt of the Storm
- Unstable Poison is more often a better choice than Mercenary Queen because waveclear is more important. The faster you clear a wave, the faster you can do something else or join your team.
- Choose Lost Soul if you can consistently auto attack a hero (Dragon knight and Triglav Protector on Volskaya count as heroes), if not, take Barbed Shot for better single target damage.
- Choose Mind Control against heroes like Zul’Jin or Butcher, who rely on AA’s and are basically unaffected by silences.
- Choose Bolt of the Storm if you need better escapes, if not, take Withering Barrage for Q cooldown reduction.
Strategy
This build is not meant for crazy plays or risky micro, like Genji. This is a simple build that should allow you to stay safe, deal damage in fights and still allow you to be a laner. Getting camps is important when playing Sylvanas because of how efficiently she can take them, but do try to help your team during fights as well because Sylvanas is good at that too. Perks of being a generalist hero.
Laning
Start the match by soaking xp. You can also shut down the forts early with your trait (D) but pay attention to enemy rotations because if they’re smart, they will try to stop you.
Siege camps become available after 1 min so as soon as they come available, get them. At level 4 you can keep camps stunned without your trait as long as you switch targets to keep them stunned. That talent also makes your mercenaries more powerful and allow you to deal more damage to enemy mercenaries.
Try your best to capture camps right before objectives. Its okay to defeat camps and leave them uncaptured, just keep an eye on them so no one steals them.
Try to avoid split pushing unless you are okay with giving the objective. On maps like Garden of Terror and Cursed Hallow, giving objective to take a fort can be more valuable than one of those early objectives. Make sure to consult with your team so you are all on the same page.
Team fights
First off, when team fighting, use Q as much as possible because her level 1 talent makes her AA’s a lot faster and she gains spell power if her Q hits heroes. Always use Q when you have the chance, but make sure you stay within range of a hero so you can gain more spell power. W is meant for you to spread out your damage to the whole enemy team. Pick a target and focus that target while your W is active to maximize damage spread. Use E to hard engage or retreat/reposition. But I would mostly stick to using it to retreat at first until you get a hang of Sylvanas. If you use it unwisely, you’ll end up in the middle of the enemy team with no escape and most likely cause yourself to die.
Mainly, what you want to do during team fights is stay near or behind your frontline and try to use basic attacks on enemy heroes. The Remorseless talent allows your damage to spread to other heroes just by basic attacking them, while also increasing your range, so do that as often as possible while using Q and W to add in more damage.
If you have the opportunity to focus down their backline, do so. While your damage still spreads to others, try not to only focus the tank 100% of the time. Attacking the backline is important too. If it is not safe to focus the enemy backline, focusing the tank is okay because of how well Sylvanas spreads her damage. Use your E to reposition if you need to and keep trying to send out basic attacks as often as you can. Use your R when they are somewhat clumped because the more heroes you hit, the safer it is to hard engage and secure kills. You can use your R to stop someone from chasing, or to finish off someone as well.
I hope this guide helps anyone looking to start playing Sylvanas. This ended up being longer than I thought. 
Note: Video removed due to issues with my youtube/google account safety. I apologize for any inconvenience this causes, but a repost of gameplay isn’t likely. Sorry about that.
Here’s a link to my intermediate guide. Thanks for reading.
https://us.forums.blizzard.com/en/heroes/t/sylvanas-intermediate-guide/55996
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. And then only I’ll go with her against human players. So it is not for today XD