I am new here ,and I do not know where this topic can be submited in this forum ,so I have to submit here,sorry.

I am ready to learn oracle now ,but I do not know where I can learn from.as we know ,there are two systems frequently uesd which are 8i and 9i,so my question is what I should learn first ,8i or 9i,and need I learn the lastest version ?

also ,I have to download oracle system from otn.so what is the difference between personal and standard edition?as I learned ,after installing the oracle standard edition ,the window system will run very slowly.As a beginer,need I install standard edition for my learning?

Any help will be highly appreciated !