Tiny distros that helped me.

If you have a windows PC and it is very old maybe my recommendation will help you.
Why I needed them and maybe they will be useful to you.

The only 3 distributions I have used are:

1. Puppy Linux - minimum system requirements: Processor with a clock frequency of at least 300 MHz; RAM not less than 128 MB; 512 MB of free space on a hard disk or USB drive; Video card with support for a screen resolution of at least 1024x768 pixels; CD/DVD drive or USB port for booting the system.
   I needed to work, my laptop had 1 GB RAM and 1 GHz processor. But it had a glitch on the motherboard and the Windows OS kept rebooting. Only installing Puppy Linux gave this hardware a new life.

2. Tiny core - Minimal configuration: Tiny Core needs at least 46 MB of RAM in order to run, and (micro) Core requires at least 28 MB of RAM. The minimum CPU is an i486DX. Recommended configuration: A Pentium II CPU and 128 MB of RAM are recommended for Tiny Core.
   Another story I need to install a running virtual machine and Linux on Windows. There is no talking about the latest distributions like Ubuntu. And also about highly loaded VMs. About lightweight VM installation and Puppy next time. Well, only tiny core linux allowed me to work.

3. bodhi linux -Minimal configuration: 512MB RAM, 5GB hard disk space, and a 500MHz processor. 32-bit processors without PAE capability are supported on the same terms as PAE-enabled ones.
   For this distro only compared with puppy and tiny on performance, and if the previous ones wouldn't work, that would be plan B.

Off topic but the first OS I used was Knoppix linux - this distro ran from a CD, it was a temporary PC I borrowed from a friend but I couldn't install my OS on it, it was 2002 and the first distro that could run as a liveCD, on very weak hardware but now it needs 4GB RAM which is not tiny.