Just wondering if someone could care to shed some lights about my confusion.I received numerous phone calls with people offering me "free" online classes promising 100% guaranteed placements. What struck me is the fact that some seemed to hint I wasn't qualified enough due to my limited background. 

But the biggest confusion is, some companies are offering 6 week classes (M-f 9 am- 5 pm) while some are offering 2 day classes for 6-8 weeks)..... Now my question is, If I were to join the latter courses, will I have received adequate training so that I wouldn't get fired during the project? 

Somebody kindly help please.