If the data in your charts is not accurate or up to date, it can harm your trading without you even realizing it. Data needs to be structured in a manner by the charting program that allows you to see various time frames, patterns, and layouts so that you can determine who controls price at that time. There are 9 major Market Participants all trading and investing at different times and on different order processing platforms; 54 Dark Pool Alternative Trading Systems ATS, 9 Electronic Communication Networks for Electronic Trading aka Day Trading ECNs, and 16 US Exchanges. Data must be gathered properly and accurately from a vast number of locations, so make sure the charting software you use has reliable Market Data. Just because it is in your broker account does not mean the Data is properly structured, sorted, documented, and delivered timely. Your software should also include other market data beyond just US stocks. If you are trading in another country, you need charting programs which have that market data accurately displayed and readily available. If you want to trade other instruments beside stocks, the charting software must include data for that instrument.