Glossary
Risk capital is money that, if lost completely, would not have an overly harmful impact on you financially.
Articles / References
Investopedia: Risk Management [ here ]
Baby Pips: What is risk management [ here ]
Baby Pips: Risk Management in Forex [ here ]
MAE, MFE and R Multiple [ here ]
Chart with Traders — Best of Risk Management (vídeos) [ Part 1 ]