One of the best ways to keep pasta warm is to use a vacuum flask. Put the cooked pasta into the vacuum flask and seal it airtight. This will help keep the heat in and the pasta warm for a longer period of time.
Another option is to put the cooked pasta into a pot or casserole dish with a tight-fitting lid. Place the pot on a hotplate or stovetop set to low and the heat will keep the pasta warm.
You can also keep cooked pasta warm by preheating your oven to 200-250 degrees and then placing the cooked pasta in a baking dish with a lid and putting it in the oven. This will keep the pasta warm for a decent amount of time.
If you don’t have any of these options available, you can also place the cooked pasta in a bowl and cover it with a damp kitchen towel. This will help keep the moisture and heat in, keeping the pasta warm for a little while.