Can I ask what is the samesite is for cookies

What I Know:
Strict : cookies will be sent on samesite
Lax and None : will be allowed to sent cross-site but need HTTPS

but Im still confused,
currently my .Net Core api is the one setting up the cookies for my ReactJS

will SameSite.Strict, that still work if for example:

1.My ReactJS and Net Core are on different ports but same machine?
2.Different Machines?
3.Same machine, different ports,same domain but different sub-domain?