Best Free Software To Brighten Underexposed Video

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How to do it in iMovie:
Use iMovie Color Correction to Change Color of Video on Mac

Any other halfway-decent video editor should have similar controls.

Thank you VWestlife. I read it over a few times.

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Can someone recommend a tutorial they feel is very helpful for brightening underexposed video footage?

I'll do you a quickee on Colormill; what point are you at? Do you have the filter installed OK in VDub or do you need help with the setup?

Thank you Alwyn.
It is a very kind offer. I really appreciate it.
Once I get further along it the process of learning how to correct, I will get back to you if I still need to take you up on this kind offer, and if you still have the time to do it.

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Hello,
This tutorial explains how to correct an underexposed video in DaVinci Resolve. Hope it helps!
https://youtu.be/PwDSizASaLs?si=CyOB7tW1-IktrJZe

Dear HaleyWang0909,

After watching this, I think I felt like the cave people, after they first saw fire.
Wow, I need to watch this over and again a few times and experiment.
Thank you.

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....tutorial that generally describes the best methods ..... I know there are a lot of tutorials on Youtube, but some of the ones I have tried watching are unintelligible. Can someone recommend a tutorial they feel is very helpful for brightening underexposed video footage?

There exists no such thing like a "generally best tool/method for ......". And your problem may be more complex than just "underexposure" - who knows.
First, you should learn and understand video basics (what are video levels and gamma, and how they affect brightness, contrast, saturation). Then you will probably understand the tutorials and recommendations better and you can work with of any of the recommended tools once you understood the basics. Otherwise you are just wildly tinkering with "tools and settings" which usually leads to nowhere, I am afraid.
Or maybe you upload a few seconds of a problematic scene and users can give you advice using their specific ("recommended") tool and method.

Dear Sharc,

Yes, I definitely need to spend time on learning more. My prior experience with video, was just trimming and fps and container conversion. So, it was pretty much load the file into the program and few steps later I was done. This kind of correction requires a lot more user steps. So I am going to take your suggestion to heart and learn more first.