I've installed oracle 11g express edition and sql developer. I don't know ho to connect to a database on remote server. Can anyone help please. Note that I didn't installed any other software like oracle client. Please help, I'm new to this environment
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If I understand you correctly, you want to connect SQL Developer to an Oracle XE database on a remote host.
Assuming you installed everything with default options and provided you have nothing blocking the network traffic to port 1521 of your oracle server, you should now be able to connect.
I just happened to see a nice screenshot in another question here: How to open Oracle listener for three database instances?
I recommend the book Oracle Database XE 11gR2 Jump Start Guide by Asif Momen to get you started. It's available as an e-book on Amazon or can be read on Safari Books Online, I believe they still offer a free trial.