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Hi Laurent!
I am also a beginner. A few weeks I bought a 10" dobsonian (dobs for short). Dobsonians are great because the are relatively inexpensive compared to other types of telescopes while getting a decent aperture. They are easy to use and some come with a GoTo option. GoTo is a motorised tracking function that finds and track stars for your (if correctly aligned). Collimation (optical alignment) is important, but easy to master. It should only take a few minutes to perform at the start of viewing sessions. The downside of Dobs is that they are not well suited to astrophotography because, even motorised, the mount down follow the true celestial movement (to achieve this you need an equatorial mount). However, AP is possible if you limit yourself to short exposures. Essentially, this means that you can only take pictures of the moon and planets. Deep sky objects (DSOs) will be much more tricky to catch. I have just started my AP journey and with the moon an planets, there is plenty to keep me occupied!
Prepare yourself for a wonderful journey!
Cheers,
Eric
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