Is there some "thumb rule" on how to choose the width of candlestick bars for analysis in relation to the time period for which a stock or currency pair is being analyzed? Obviously, minute bars do not make much sense in a 1-year chart, and hourly bars make even less sense for day-trading, but are there more specific "best practices"? I'm particularly interested in what is typically used in forex day-trading.
There's a lot of web pages and YouTube videos talking about moving averages and what not, but, surprisingly, I failed to find an answer to what seems quite a basic question.