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http://www.gcflearnfree.org/, https://alison.com/, http://www.howtogeek.com, http://www.marcandangel.com/, http://www.tomsitpro.com, https://www.reference.com, http://www.cio.com, www.gospel-outreach.org/
Check out Nadrus.com, there are high quality Arabic courses some free of charge
You might want to check also Udacity (https://www.udacity.com/)
They offer nano-degree programs and some free courses.
try udemy, coursera they have free courses.
I find the online video tutorials on Youtube very useful. If you want reading resources - try simplilearn.com!
WWW. Simply learn.com, and , WIKIPEDIA, are some of the , online , training resources.