I think everyone has their own preferences in trading and whether a signal provider would be beneficial for them or not depends on their trading style and knowledge. I think that trading indicators are also useful since crypto currencies are highly volatile.
Trading indications are yes really needed, besides this, one must be updated on news and updates of the coin he/she has invested, so that one will know when the coin will spike up or fall down in the market. Choosing the right and the best coin to invest is really must. Need to choose the best exchange where the trading volume of the coin you wish to invest is really high. Besides all these, never ever panic or fall into market manipulation which will lead you to loose. Be patient enough always
I think for those who choose coins and markets are a must where traders can choose comfortably, perhaps the Binance exchange that is still becoming popular to trade there.
And many other trusted exchanges.
On the other hand, indicators and chart analysis are very important things to determine where the coin will go, usually traders always use this method and also other references as additional options and some even formulate it more than this, so the technique in trading is very broad and we have to be able to combine them.