General knowledge about the champion- Ying's "Illusions" heal the player with the lowest health first. For example if your ally Skye has 1800HP and your Barik has 2000 (which is something like half-HP for Barik), the Skye will be healed as long as her HP are lower than Barik. That's why you should prioritize your RMB "Shatter" to heal your tank as it would not be healed that much with "Ilussions".- When you use your ultimate, you can teleport to an ally when using "Dimensional Link".- If you use "Shatter" after the 3/4 of your reloading animation, it'll be canceled and you'll be able to get your ammos back WAAAAY quicker.

Ying is a tricky champion but you can get a huge amount of heal with her if you play well.

Try to place your "Illusions" in the way that enemies can't hit them and that your allies can get healed by them. Be careful to sometimes place them in places that are safe too if you need to use "Dimensional Link".

A great placement is : one "Illusion" on the point, one "Illusion" on a flank route that my flank is using so it can be healed by the "Illusion" while you're healing the team!
Do not stay static, try to move a lot as you're an easy target for flanks or even damages. Try to stay close to your frontline. If they die, try to play safer and place your clones in a way that they can heal you too and that you can teleport to them if you really need. Don't be afraid to use your ult to teleport to your allies if they need your help and that you're way to far away or if you need to escape super quickly and you can't die because your team absolutely needs you in that situation. If you rush "Morale Boost", that ain't a problem.