1- One is Coinigy. It's the second time I heard about this platform and I just checked the homepage. At first glance, it seems more like a way to trade from one place on multiples exchanges. If I'm only beginning day trading and I'm using only one exchange at this time, is there any edge I could get from this platform? ...or should I only look into this when I will be more experienced and want to trade on more than one exchange?
So preferred the kind of trading system that Coinigy offer? It's way more advance but no harm if you want to try it now.
For usual trade, I suggest trading at Binance. Then step up to other trading platforms while you are gaining knowledge along the way.
Either way, your plan is good as long as you understand the basics and the risks associated with doing trades.
2- The second is Forexfactory. This seem to be a excellent community forex traders site with a useful forum. I noticed on the site that there also a sister site called "Crypto Craft" that seems kind of like the same thing but for crypto traders specifically. Are those two sites a major community hub for traders? Are there any other similar sites like those two?
Since both platforms are meant for trading discussions, yes that will be a good community to act as your reference especially if you are on Forex.
For crypto, it's up to you where will you get a reference, either CryptoCraft or Bitcointalk.