Put in container, let cool, place container in trash. Empty jars or bottles are common options.

I use mine as a firelighter for my wood heater.

People also use it to make diesel if it's not solidified animal fat.

There are are things you out in the cooking oil to make it harden here in Japan. It's like these flakes that look like shredded soap we can buy in the 100 yen shop. Maybe there's something like that where you live?

I just let it cool and then double-bag it. I get a ton of extra plastic bags from stores, so I hold on to them to reuse as garbage bags.

Or put it in another container you're going to throw out anyway.

If it‘s not a shitton of oil, I put some napkins in th pan and let them soak. Then put the Napkins in the trash. I do that once everything’s cold, of coursey

Everyone says put it in a container and throw the container away, but I don't have a bunch of empty containers around that I can just throw away. My best method is to, while the oil is still warm and liquid, use a paper towel or two to soak up all the oil. Usually it's safe to toss this into the garbage as is, as it will cool down considerably, but if not, give it a few minutes before tossing in the garbage. I never wait for it to harden, and I've never melted a garbage bag before. Once there's only a little bit of oil left on the pan, an excessive amount of dawn and a good bit of scrubbing will trap the oil and make it safe to dump down the drain. If you aren't using that much cooking oils, you can also compost the oily paper towels, but I'd check with your local compost folks first to make sure they allow it, as too much cooking oil can ruin a compost pile.

You should start filtering and stockpiling it for the eventual decline of society to the point that it’s the only fuel source left to run diesel engines on our Mad Maxmobiles.

Soap! (Just kidding go for the other replier suggestion)

Public infrastructure can be built to handle it but it is significantly more expensive, and since a lot of public infrastructure is incredibly old you are damaging pipes and causing bills to go up for everyone in your area

Bazelgette wants to fight you in a cage match and my money's on him.