Read the article: Bidding Bible - Part 1 - Bid your hand
Most of the time our goal is to describe our hand to partner. The idea is that, if at least one player knows details about both the players hands, they will be in a better position to judge the contract than if they only know about their own hand. Take this example
Here we should bring partner into the conversation - we have already shown 5 hearts, lets now involve partner. Make a takeout double, that describes the shape very well - tolerance for the other suits, 5 hearts as already shown, short spade. Partner is now well placed to make a sensible advance to the auction, or even pass 3♠X if appropriate (perhaps they have 4 good spades).
This is a classic position where we should describe our hand to partner, which should be the goal of most bidding situations, thoughts like these will lead you in the wrong direction
Check the next reel where a contrasting situation - bidding the contract is appropriate.
The most important signals
Double or bid?
Bid as high as possible!
Defending against a multi 2♦
Transfer or not?
Nv compete
How strong vulnerable?
Preempt suit quality
6322 and 7222
2♣ opening
Doubleton lead
Passive lead
When to lead active
1N with 5422
Takeout double
Negative double
Splinters
Competing partscore
Try not double
Ace Ace King
2 level overcall
Lead Trumps #1
Lead Trumps #2
7 card GOOD suit
To open or not, pre-empt or not
Let the opponents play when they are misfitting
The strongest hand
Be practical
Losing trick count bidding
Favourable vulnerability
Be a nuisance
Big trump fits
What does 3♥ show?
Mental game
6+ card suits
Use puppet stayman more
Don't push slam in competition
The unusual 2♠ bid
Intermediate jumps
Conventions
Choice of equal cards
Don't false card
Never preempt with 11 points
Is the bid forcing?
Double, Double
Double 1NT, next double
Counting Habit #1
Opener rebidding bad suits
Responder bidding bad suits
2♦ opening
Don't split honors
Bid your hand
Bid the contract
Long suits
Long suit defence
Weak dummy