Defense is not usesful,
some healers learn life extention for some secret reasons
Blessed Bravery is learned by most healers
< really useful: recommanded 4,master.
up to 4, you only need one fireplant. but after 4, you need another reagant
Sleep: learned by hybrids and combat healers
Very useful in PVP. Recommanded:2or more
Light sheild: Learned by healers who plays raid"Sairen", and Lir on episode 5-10 safely.
Recommanded: 1 or more. 0 is okay, but you have to rely on other healers..... In sairen, you definetly need to learn one. Sairen is good raid stage, gives you very very good items.