Most traders use Moving Average Convergence Divergence (MACD)[1], Balance Volume (OBV)[2], and Relative Strength Index (RSI)[3], as a basic indicators for trading, they help in determining entry and exit points, which can be the basis for placing buy and sell orders.
these indicators should not be separated from metrics such as results from the glassnode, volumes of withdrawals from platforms, news, and analysis of market psychology.
These metrics above are based on Bitcoin trading and a few altcoin pairs.
As for the rest of the altcoins, they are just speculations, relying on news more than technical analysis.
MACD has been a cornerstone for crypto and has been used the most by any sector. I mean it is of course used in other assets as well, stock world, forex and even gold at certain times (gold is a bit more slower so not really needed). However, crypto has used it a lot more and I believe that there must be some reason for that.
Moving average matters a lot because since we do not have any instinct value, that means we are just investing based on what we think it worths. It is basically what we "believe bitcoin should worth" when we buy and sell. So, that is why there is probably a bigger reliance towards MACD since that is a bit more related to crypto in that sort of way.