If you main healer here are some tips tricks and info that might help you from either getting reported, getting your specific hero banned and/or keeping the survivability of the team.
1.Know The Skill to Escape: Healers are the main target of every fight. Whether its beginning or end game make sure you know the skill to make your movement speed faster, teleport skills or a skill that stuns/slows multiple heroes.
2.Determine Your healing capabilities: Look at how much health your healing your teammates. Each healer is different. Healers like Tyrande, Morales or Uther focus on one person for high heals unlike Kharazim, Rehgar or Auriel its either an area, chain or surrounding high heals.
3.Look at the Opposing Squad's Heroes: Depending on the heroes chosen the builds I've given can make it vary. If one of the Heroes chosen is Zeratul or Nova you need an area reveal skill or devote talents to increasing your heals.
4.The Ultimates: Level 10 is the game changer. You are free to choose the ultimate you want but the ones chosen here give the ability to heal more, keep your teammates alive, bring back a fallen hero into battle quickly or to give damage and healing at the same time.
5.The Eye: This is for specific heroes especially Kharazim, Rehgar, Uther and the others whos high healing focus one hero and give a high amount of health back. The eye is a trait for us in which you can determine the hero who is receiving fatal, or devastating damage. This is the most complicated thing to do because as the game goes further, heroes get better talents and better stats so looking for the one who is IMPORTANT and with the LEAST amount of health in a fight is crucial. To earn this play as a hero whos abilties or heroics help a single or maybe multiple persons in a team fight. To challenge you, you must keep the whole team alive. 1 death of a certain hero can end the game.