New to RoR: Need some assistance displaying data from multiple tables.

Since you have not mentioned the associations between the models (user
has_many tasks for example) I guess that you are not familiar with
such concepts. Have a look at the Rails Guide on Associations (and
all the other guides for that matter). In fact I strongly suggest
that you work right through a tutorial such as,
which is free to use online, which will introduce you to the basic
concepts of rails. Make sure that the tutorial is for at least rails
3 and that you use the correct version for that tutorial. By the end
of that you will likely be able to answer the questions yourself.