Now that we're talking about the Serbian war, I must acknowledge that I don't actually now much about it. Anyone willing to give a concise explanation.
The first one or the second one?
In short:
Generally the first one is about countries not wanting to be in yugoslavia anymore. So they went independent. But serbs that lived in the region of the new countries wanted to join serbia and not live in the new formed ones. So serbs in the new countries, with help of serbs from serbia (or better said yugoslavia) fought for territory where they lived. Heavy shit happens with killing of different ethnic groups. Its a standard civil war. In the end, most of serbs from croatia were expelled from it, while in bosnia formed somewhat independent region republic srpska where majority are serbs
The second war is war for kosovo. Kosovo was mostly populated with albanians and serbs. Kosovo albanians with help of albanian country organized a separatist group called UCK, that fought again police and similar for independence of kosovo. Nato bombs serbia on the context of fear there will be ethnic cleansing as there where few places where it was believed albanians civilians were killed. After bombing started, serbs started moving all kosovo albanians to albania. After the bombing ended, serbia accepted to move their military/police from kosovo, and in its place KFOR/NATO troops moved in to "protect" the people. Unfortunately, than all the albanians started moving serbs from kosovo to central serbia, so now, very little serbs or other minority live on kosovo, that do not recognise kosovo as a country and want to separate to serbia.
So now we wait for another war, that will probably be around bosnia in future, as republic srpska is interested in independence from bosnia, and another kosovo war, where serbs will move in the kosovo to retake the lost territory. Serbia sandzak is another region where a lot of bosnian live that will also probably want independence at some point. But it will probably not happen in our life time.
Anyway, take this with grain of salt, as I am from serbia, or better said was from kosovo, and after nato invasion we escaped to central serbia. And the funny thing is, I am mostly croatian. So, its all such fucked up shit.