Most all trends are composed of two things. A BO and a Channel. These then are more often than not followed by a TR or some sort trading range price action. Different trading techniques are used for BO’s…. for channels….for TR.Imo, TA for the majority is a use of indicators, there are myriads of indicators.
The majority are wrong, the majority talk nonsense, they lie, exagerate, boast, predict, flounder, make no money, amateurs, lack education.
However there are experienced traders who make money using TA but they are the exception. Imo experience gives them a sixth sense about how price ducks and weaves, they have found an edge and who knows what it is because every trader has unique tools.
A child can know no trading and hindsight guess a bear or bull market by looking at a chart to see which way its trending, but that child wouldn't know accurately if trend is changing or continuing.
The one key thing is inertia. The tendency of the market to keep doing what it is doing, at least for a while. There are signs when the market is phasing from a BO to a channel and from a channel to a trading range. Inertia shows up in a chart as the picture is being drawn.