Intel is everything, that's why it's exteremely important to choose right information sources that will supply you with accurate updates, news and other content related to cryptocurrencies. If you choose the right asset in a right time you are half way through on your path to success. It's also a very first step before taking the decision and executing the trade. So take your time while browsing these websites, carefully picking your assets of choice.
You will be surprised when you find out how much information can be obtained among Slack and Discord users, if you join the right chat rooms. There are many groups where you can find coin developers and people that are in a "close circle". Perfect place to ask questions, find about buy signals, major coin updates and plans for the future.
This one is not THAT essential - still though, if you think that you might get a little bit too enthusiastic about a small cap altcoin that just "sounds so great" - scan it through this website to make sure it's not a crapcoin that you are gonna loose whole your hard earned portfolio on. This website works on a user basis (more or less like wikipedia) - people look around, find coins with 0% growth potential, then report them on deadcoins.com and prevent other users from falling into a trap.
Moving to a next step that is necesarry to be taken before trade execution - the technical analysis. There are certain things that you can "scruitinise" in the graphs and charts and after that - plan your trades accordingly. For that you need tools like trend lines, fibonacci retracements, notes and comments inside the graphs. These sites will provide you the best drawing tools so you can analyse the hell out of the graphs of your favorite coins!
This site is mainly focused on Bitcoin - offers awesome dynamic graphs that are highly interactive and fully customizable. You have access to graphs from few major Exchanges in different currency pairs that vary from fiat to pure crypto ones. You can also analyse othe major currencies like Litecoin, NXT or Doge (and plenty of others - the variaty of coins that are available for graphical analysis does not make sense to me - Doge but no Ethereum? Why? But maybe it's some sort of permission issue or something...).
Another site that is prety similiar to Bitcoinwisdom but (unlike Bitcoinwisdom) offers more currencies and even more drawing tools. If you are willing to pay monthly subscription you can also use a trading platform that is offered right on the site. They have a 30 days trial if you would liek to try it out. (I personally prefer Bitcoinwisdom as I am more familiar with it and I do not usually do deep technical analysis on low cap coins, because in my opinion it's pretty pointless - their graphs are too hectic and unpredictable, but again that's just my point of view).
The nodeinvestor is a combination of news, market overviews, charts commentaries and much more. Basically it's a centre for cryptocurrency analysis. You can ask questions there, have a look on written analysis and other analysis related posts from the community users and, of course analyse yourself. There is one big "but" though - the fact that there are only top 6 cryptocurrencies available makes it a pretty limited analysis tool for those who want to go dive into something more "exotic".
Now you are finally ready to execute - top coin picks are chosen, news and information gathered, graphs analysed, so without further do you are more than ready to get straight to it. In the process there are still few things though, that could make your trades easier, well-arranged and much more fun.
Last but not least - to execute like a king you need a decent trading platform - a place where you can connect all your exchange and market accounts into one comfortable workspace. A place with all the necessary tools, indicators and charts. I could not come up with anything better than Coinigy - it simply does not have a competition. You have everything you need for cryptocurrency trading under one hood for 20 bucks a month. A wet dream of every professional cryptocurrency trader (or at least mine).
That is it for the tools for cryptocurrency trading. I hope you could find something for yourself and I also hope it will help you and your future trades. If you know any other tools, websites or sources that could help people with trading, feel free to share them in the comment section below and as always - have a nice day!