I have a good knowledge of computer but I need to pursue some side hustles that will require that I present certificate as a proof to qualify me for the hustle

Please recommend any online free course that comes with free certificate in any computer related course - even if it is mere computer appreciation program.

You can learn Graphics using CorelDraw or Adobe Illustrator. Most of these softwares come with help manuals. Have you own personal computer and be dedicated to teaching yourself.

I need to certificate to pursue something that is why I am not considering

You can start by taking courses on LinkedIn to get certificates. If you create an account now, you will get a month free. It depends on you to utilize the time you have.
Also, if you want a way to publicize yourself online, you can create a digital business card with BizCard Digital Business Card. I have one and I must say it has helped showcase my work and tell people what I can do before they contact me.
Good luck with everything!

TabithaDanisi:
You can start by taking courses on LinkedIn to get certificates. If you create an account now, you will get a month free. It depends on you to utilize the time you have.
Also, if you want a way to publicize yourself online, you can create a digital business card with BizCard Digital Business Card. I have one and I must say it has helped showcase my work and tell people what I can do before they contact me.
Good luck with everything!

Thanks