“I marinated it overnight in some garlic, ginger, lime, and olive oil.”

You made some delicious grilled chicken for a party. A guest asks how you made it. You say:

I marinated it overnight in some garlic, ginger, lime, and olive oil.

marinate (a food ingredient)

One technique in cooking meat or vegetables is to put them in a mixture of different flavors and let them sit for a while before you cook it. The meat or vegetables then start to taste like these other flavors. This technique is called "marination".

You can "marinate" ingredients for a few minutes, a few hours, or a day or two. This is different from some other processes, like "pickling", because you almost always cook food after marinating it.

do (something) overnight

You can describe a process that starts one day and ends the next day can be as happening "overnight". For example:

Soak the beans overnight.

Let it dry overnight.

some (stuff)

Use "some" to talk about a general amount of something. For example, if you don't want to specifically say how much of an ingredient to use in a recipe, use "some":

Sprinkle some salt and pepper on it.

"Salt" and "pepper" are uncountable, but you can also use "some" to talk about countable things:

There were some people there from Taiwan.