What testing design techniques have you applied, which do you know?

Among the test design techniques I have applied and know, the following can be highlighted:

• Equivalence Partitioning — dividing input data into equivalence classes to test one representative from each class.
• Boundary Value Analysis — testing at the edges of input ranges where errors often occur.
• Pairwise Testing — testing all possible pairs of parameter values to reduce the number of tests while maintaining coverage.
• Cause-Effect Graphing — constructing a graph of logical conditions to generate tests that cover all logical paths.
• State Transition Testing — testing the system's behavior during transitions between states.
• Use Case Testing — testing business scenarios and user stories.

Example of application: for a registration form, I used equivalence partitioning to check valid and invalid emails, as well as boundary value analysis for password length.