i know Courage and Athletics increase (progress in leveling up) health which other skills make a big impact in increasing health?(so i can buy implants for it) and what is the max health?
http://www.entropiaplanets.com/wiki/Skills there is no max level for anything in Entropia that I am aware of. Skill compression or whatever you want to call it just makes each point more expensive or harder to aquire than the one before it. For example a 10ped skill chip will roughly take you from 0 to 2000 skill points but a 250 skill chip will only take you from 10000 to 10100 skill points (rough numbers from memory so dont quote me, but the idea is the same)
A number of other skills contribute to HP since VU 15.15.4. I'll update the table. As for nonlinearity of skill curve, one 10 PED chip takes you from 1 to 1880 points (+1879), another - from 1880 to 2547 (+667), yet another - from 2547 to 3010 (+463) etc. (see Avatar Skill Calculator)