I bought a telescope with the following specs.:
Objective lens: 2.99"
Focal length: 900mm
Eyepieces: 20, 12.5, 4mm
Finder scope: 6 X 25mm
Barlow: 3X max
Magnification: 575X

I know it is a beginner model which will suit me fine, my question is that I don't know what actually these terms mean!

Can anybody advise and also suggest how can I use it (and what I can observe with it)?

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