add sql course (#4897)
* add sql course * add react free course * Revert "add react free course" This reverts commit 3607c3b935d508d55a3df69405ad28d1c8e8f3d1. * Update free-courses-vi.md Co-authored-by: NSeth <seth@elypia.org> Co-authored-by: NSeth <seth@elypia.org>
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