Keep in mind that outside of raid content like savage Alexander and extreme primals healer dps is a nice thing to have but far from required. That being said, if you want to really master your class, even as a healer, you do well to look into the dps part.

On a side note, DreamWeaver mentioned focus target. On a controller it is simply done by bringing up the sub menu via pressing the square button while targeting the boss and selecting ficus target. There's also a text command to type in chat, but I can't seem to remember it atm.