If you like video content, the Daniel Negranu Masterclass is extremely well done. Phil Ivey also has content on that site but I found it much less comprehensive

If you like video content, the Daniel Negranu Masterclass is extremely well done. Phil Ivey also has content on that site but I found it much less comprehensive. After that, perhaps watch some Doug Polk on Youtube to see how he uses the concept of putting people on ranges of hands and what his thinking is in a specific spot.