Frequented Links and Reference Papers

Thinkorswim User Manual
FINRA Dark Pools Data
Daily Treasury Yield Curve Rates
Glossary of Trading Terms
SqueezeMetrics:  Short is Long
SqueezeMetrics: The Implied Order Book
Marking Supply and Demand in Options Transactions
Term Structure (Cboe)
Term Structure (VIX Central)
NYU Volatility Lab
Portfolio: Backtester
Portfolio: Asset Correlation
Minimum Correlation Algorithm
Daily Nasdaq Retail Activity Tracker
Market Data (IEX)
Common Scenarios in BookMap (heavily annotated)

Good Reads