How do I free up space on my C drive?

How do I effectively manage the storage space on my C drive to ensure that I have ample room for my files and programs? I've noticed that my computer has been running slower lately, and I suspect it's due to a lack of space on my primary drive. Can you provide me with some practical tips and steps to follow in order to free up some space on my C drive? Is there a specific tool or software that you recommend for this purpose?