Bitcoin Forum

when trading volume decreases what information can you get? whether you can see where the price moves from trading volume? up or down? I'm very confused.

Trading volume is a very important indicator of any market ( & this importance is much bigger in crypto market due to its volatility ) , it gives significative signs of any coin/token moves ;ie , when the Trading Volume goes upper, the price -generaly- goes up too and vice versa .
You can read this article (https://www.investopedia.com/ask/answers/041015/why-trading-volume-important-investors.asp) for more information

I'am always using indicator for start trading on market.
I'am usually using tabtrader and ztrader app in android.
in there you can see moving average the price altcoin.

I think if the volume decreases it may always affect the price to go down because somehow people are pulling their investments out.

Take a look at the following website:

https://coinalyze.net/

It pulls in live prices and volumes from all the exchanges. And does this for loads of alts as well as bitcoin.

Yes trading volume can be used as a benchmark and an indicator in making decisions. This can be used as data that we can do to perform a much better analysis. trading volume can be regarded as an indicator of trust of many people to a coin to be purchased. When there is a coin that has a very high transaction volume it can be said that the coin is in demand and we can be part of the people who take advantage in making investments. While when trading volume a little then we will also feel worried about the circumstances because everyone thinks that there is something that is not convincing to the future of the coin.

I think the first thing you can know is whether to trade a coin or not is to look at the trading volume of that coin. The larger the volume, the higher the liquidity, the lower the risk. Therefore, it is very important to look at volume before trading.

  I trade volume, not transactional information.

This is important as it shows you how much interest there is in the coin. If no volume then it will be difficult to sell after you buy. Buy orders are a good indicator as well so keep an eye on those walls

It indicates both the selling part and the buying part. If it goes larger then you should still check the trading website that had the larger amount if a lot of traders are selling it or for the purpose of buying.
I guess you could see it at coinmarketcap already.

If you try to observe, there are times when the 24 hour volume is large but the value of the coin is still in red mark. That means there are a lot of sell orders that are idled in an exchange.

Install an app called tab trader,  it can show you the volume ups and down.