first time user and first time neural network learner clarification needed

hey guys,

this is my first time using Rapidminer, I been watching youtube videos on how to import data and etc.

I am having a hard time understanding ImprovedNeuralNet TAP.
So I ran the data and i got this window(see bellow)

My question is
===========
1)What is this ImprovedNeuralNet tap telling me??
2) what is output telling me??
3) what is node??
4 ) what is threshold??

5) ***Finally is the output regression written like this ??
Y= -2.544(BOOK) +1.648(Tea T-1) +1.425(Tea T-2)-1.794(Tea T-3)
==========================
==========================

ImprovedNeuralNet
Hidden 1
========

Node 1 (Sigmoid)
----------------
BOOK: -2.843
Tea T-1 : -0.918
Tea T-2 : -1.112
Tea T-3 : 2.088
Bias: -3.673

Node 2 (Sigmoid)
----------------
BOOK : 2.197
TEA T-1 : -1.435
TEA T-2 : -0.601
TEA T-3 : 0.797
Bias: -2.739

Node 3 (Sigmoid)
----------------
BOOK: -0.387
SPY T-1 : -2.403
SPY T-2 : 2.422
SPY T-3 : -4.690
Bias: -5.121

Node 4 (Sigmoid)
----------------
BOOK: -2.066
TEA T-1 : -0.799
TEA T-2 : 0.651
TEA T-3 : -1.014
Bias: -2.397


Output
======

Regression (Linear)
-------------------
Node 1: -2.544
Node 2: 1.648
Node 3: 1.425
Node 4: -1.794
Threshold: 0.196