To illustrate the example again,
2♦ bid showed 18-19 balanced. You have 27-28 of the points and your opponents are declaring on the 5 level. They will be heavily relying on trumps to make tricks, so cut down their ruffing power immediately with a trump lead.
It makes a big difference, 2 trick difference!
The full deal is
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