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I'm new to the site. My trial expired, so now I am deciding whether to pay for subscription or not.
I am interested in theory. Postflop mostly, but any video will do. Its really hard to navigate through your search engine, so I wanna ask here. Are there many theoretical video here for NLHE? Are there any series? Please name it.
Maybe there are some ways to search for it I didn't noticed. Anyway, will appreciate any help.

Try:
Maths of No Limit Hold 'em
Just about anything by Sthief, particularly Playbook, Professor Plotkin and Applied Math
Running the Streets
and if you're really brave, probably the ultimate theory series is Math Attacks by Bellatrix.