Solaris

Hello everyone,
how do you really study to become an expert in solaris OS?

Thanks

its an open question mate! go with more and more and more of practise and involve yourself with many forums like this one, so you keep yourself updated about queries/issues other admins come across.
You can ask yourself, what you should do to feel very confident in solaris.!

There's no ready-made recipe for becoming an expert on Solaris or any other UNIX systems. It's all upto you. But, here's what helped me a lot:

1. Read-Read-Read: brush up your basics
2. Get your hands dirty with the system when you get opportunity
3. Browse the troubleshooting, Q/A forums attentively; check if you already know what people are talking about. If not, get to know that.
4. Build a test environment; break things intentionally; when a man page says "CAUTION: Don't do this blah blah", just do that for fun and see what happens. Try to fix that with help of man pages (sometimes you may not be in a position to check online manuals or docs).
5. Create a file and keep a track of all the steps you have taken so far to fix a problem.
6. Learn-Learn-Learn: as technology evolves everyday, learning process never ends, so no one can say "oh yes, now I am an expert. So I gotta stop learning and start preaching"
7. "Little learning is always a dangerous thing"; so, before giving suggestions to anybody, be 100% sure about what you are saying.

There are a lot of versions of Solaris:
Solaris (operating system) - Wikipedia, the free encyclopedia
Preceded by the versions of SunOS, some of which became Solaris.
SunOS - Wikipedia, the free encyclopedia
Nobody can know them all, so stick to modern versions.

The Number One Skill is is knowing how to recover from a total disaster - like the computer room being destroyed. If you cannot do this, you are not an expert.

On the training front the Solaris Systems Administration course give you a head start, but do the pre-requisite courses first.