Did Jesus cancel the entire old testament laws or just part of it?

I am always confused regarding the role of the laws of the old testament in Christianity (in common with the main movements). Did Jesus cancel the entire old testament or just part of it? Or maybe he didn't cancel and just said it isn't obligated? For example, I believe the majority of Christians eat pig or shrimp and don't keep the laws of the purity of animals or birds that are allowed to be eaten in the bible, nor avoiding fire lighting on Saturdays, not celebrate the holidays mentioned in the bible and so on in many other laws of the bible. On the other hand, it seems that regarding homosexuality, many Christians don't support it. (I'm not sure if it is because of the religion or it's just a matter of being conservative.) Can I conclude that the laws of the new testament were (at least) partially replaced by the New Testament? If I can, so how can I know based on what some of the laws were chosen to be still relevant and what some of the laws weren't? I'm really confused to understand it. Kindly be patient with me, I am open-minded to learning about it.