I want to help underprivileged family be aware of their financial decisions and help them with personal finances knowledge. Will taking financial adviser related course help?

If you are looking at general concepts, module 1 of CFP or ChFC or even M9 paper would be sufficient knowledge.

The actual planning for low income groups require understanding their unique situation and to reduce expenses and increase income (both are very challenging for them), because they have extremely limited resources, and also trying to keep themselves sane (spending on an ice cream cone of $0.50 is already considered a luxury).

Its easier if you work with government subsidises and to manage their expectations. They likely may not even have budget for insurance.

It is good to take such courses, regardless of whether you want to help others or for yourself.