Looking to know your methods

Hey guys and gals, I am looking to learn a new language and was interested in the program, website, book or method that you learned the languages you know. I also have some questions here, if you could answer them it would be appreciated

Have you trained others to do this? Have they replicated your results?

What are the biggest mistakes and myths you see in language training?

What are the biggest wastes of time?

What are your favourite instructional books or resources on the subject?

If people had to teach themselves what would you suggest they use?

What are the biggest mistakes novices make when starting or practicing languages ?

What are the biggest misuses of time?

Even at a professional level, what mistakes are most common?

What are your key principles for better, more consistent learning?

·   What does the progression of exercises look like?

Thank you all for your time and information