Pharo is an implementation of SmallTalk.
This video Pharo Objects at your Fingertips is a good demonstration of playing with Pharo environment.
This talk What FP can learn from Smalltalk by Aditya Siram - Signify Technology by #&64;deech is an excellent talk on areas where Smalltalk excels and what FP langauges can learn from it.
How debugger works with you in Smalltalk especially in the context of TDD. No wonder TDD ideas crystalized for Kent Beck when he was working with Smalltalk.
pharoMaterials/PharoKeyFeatures.md at master · pavel-krivanek/pharoMaterials