For not to spoil the beer taste, you don’t need to know a lot. Firstly – it has not to be pure from one vessel to another. Secondly – stirring and mixing causes the beer turbid because of oxygen that oxidizes the beer quickly. Thirdly – to add half-full beer into fresh.
By no means you can’t mix different brands of beer and add to it other drinks. It is not recommended to drink beer out of plastic or metal utensils. Categorically it is impossible to quench the beer for instance in freezer or to heat.
It recommended to keep the beer out of direct sunlight, not to lay it on its side, to keep it in vertical position for beer not to have a contact with the cork.