MT4, MT5, cTrader or TradingView: which platform did you learn on?

Platform choice is personal, and many traders end up using one platform for charts and another for placing orders. We'd like to hear what works for you.

Worth mentioning:

• which platform you started on, and whether you've switched since
• the features you rely on most, such as one-click trading, alerts, custom indicators or the mobile app
• anything that frustrated you as a beginner

Please don't post download links or links to paid indicators; the forum filter removes them anyway. For an overview of the differences, see MetaTrader 4 vs MetaTrader 5 vs cTrader vs TradingView.