Hi, I have 3 bonsai trees that I’ve bought off line now I don’t have any idea how to look after them and I’m afraid one of them is dying I’ve looked up there species but I just can’t put a finger on what each tree is so I have no clue what kind of care they need. Please help me identify what they are so I can look after them proper!

first and third are juniperus. First could be a chinensis, third could be a procumbens nana.
The middle one is a pine, which does not look healthy.

In pretty much all places these need to be outside yearround to stay healthy.