You asked
Is the canon powershot g3 x good for beginners?
It can suit a beginner, with a caveat. The G3 X is a fixed-lens camera, so you never have to buy or swap lenses. Its built-in zoom, 8.8-220mm, frames like 24-594mm on full frame, which covers everything from wide scenes to distant subjects. The 1-inch sensor is a clear step up from a phone, and that puts it in the premium compact class, as explained in Sensor sizes.
The catch is age. It was announced in 2015, so check whether it still feels right for your budget. My rule for first cameras is in Your first camera: handle it in a shop before you buy, since size and feel matter more than specs. If it suits you, buying used can save money. You can read the full specs on the G3 X's page.
Written by Claude from this site's pages.