Sin and trespass

As I read through the names attached to the different offerings, I do not grasp how the name fits the offering.

For example, we have sacrifices specifically called burnt offerings, yet some of the other offerings also get burnt, so what gives.

And today as I open to Levitucus chapter five, I am reading about trespass offerings.

So how does the definition of a trespass differ from the definition of a sin? I dunno.

But as I read though the trespasses defined they seen to deal with ears, eyes, and body contact.

If I am witness to an oath, and (I assume) there is a problem later on with it (?),

and I keep my flapper shut, I am guilty, I have trespassed.

Or if I make an oath without really thinking about it, yeap, I trespassed.

Again I will make an assumption that I am not seeing specified in the chapter,

if I make an oath and do not keep it, I have trespassed.

Thirdly, unclean things.

We have not seen this up to now, if I touch a dead whatever, I am unclean,

I need to do a trespass offering to make things right again.

I find it interesting.

But I still do not understand the difference between sin and trespass.