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Hello there!
I've been getting a few offline clients recently. More than I can handle.
Since my expertise is mostly on web development.

What are some resources that can actually help me help clients?
In terms of SEO, Facebook, Twitter, etc.
(Please no advertising wsos)

Thanks a bunch.

I would recommend check on the courses on UDEMY for social media marketing. It can boost your skill sets and knowledge! Hope this helps.