I noticed this question posted to this site asking for books for beginning learners. This type of resource request seems to be too open-ended and subjective for a stack exchange site, where specific questions and objective answers are desired.
The strength of Stack Exchange sites over a mere forum is that they offer expert answers to specific questions, which other experts can rate, giving a clear idea of which the best answers are.
I would argue that such open ended questions as the one you have quoted (see also: this question about learning other languages by means of Esperanto go against this, invite infinite "Oh, and there's also" comments or answers, which make a nonsense of voting and dilute the value of the Stack Exchange approach.
Such questions belong much better on a general forum like that of lernu.net, where people can add their suggestions at their leisure with no need to determine the "best" answer.