Active leads are sometimes called for, one reasonably common scenario is where we know the opponents have a long side suit - so we might need to set up our tricks in a hurry. For example
Here we should try to get the sense that dummy will have a 5+ card diamond suit. Also with our hand we can see the diamond suit is probably breaking well and the finesse is on. We need to attack our trick source asap. The full hand
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