Binoculars can vary dramatically in price (from €50 to €2,500), weight (up to 1 kg), function and size. So you need the help of a specialist store or website and you must consider how far you wish to see.
When you are looking for binoculars, you will come across various figures. For example:
Extensive website with buying tips, a binocular dictionary, tips from experts, tips for setting your binoculars, etc.