Since December 2017 we've seen a massive influx of new investors in the crypto space, and the inflow of their fiat has lead to a massive boom for altcoins. This has inflated values and with many making astronomical fast and easy gains by simply gambling on symbols on an exchange, I am seeing the market reward the very worst type of behavior for investors.
First of all here are some good tools that I've found have helped me a lot:
Market News and Tools
http://www.coindesk.com - Overview of what's going on in the crypto world
http://cryptopanic.com - An aggregator of various crypto sites and news, filterable. I use the pro version to customize the feeds but the free version is good enough for most.
http://coinmarketcap.com - Not just for checking prices, they also are the most convenient way to start your research as they have the blockchain explorers, official website links and also a useful API that can be linked to Excel.
http://cryptomaps.org - Visualization of price across different segments, primarily hashing functions and ICO release dates
http://onchainfx.com - A better version of coin market cap, has all sort of columns and you can add flags. Only downside is it only has 61 cryptos, but its always adding news ones.
http://icotracker.net - I like this site for looking at what ICO are coming up
http://icobench.com - Another ICO tracker which does nice summaries, shows teams, milestones, financials and gives a rating for each ICO
http://solume.io - compares the number of Twitter mention increase decrease to price
http://eveningstar.io - this is basically like Morning Star except for cryptos
https://bitcoin.tax - for calculating taxes owed on your crypto gains
Communities
BitcoinTalk Forums - Probably my favorite place to discuss crypto. Much more intelligent discussion than in this sub.
Steemit and Medium have tons of great blogs about crypto, find what alts specifically interest you there.
Follow developers on Twitter, Reddit has decent communities for each coin, /biz/ is for pink wojaks, memes and pumping
Portfolio Tracking
Delta - get this app, its awesome and better than Blockfolio
There are online sites like AltPocket and CoinTracking that will do portfolio tracking but I haven't found any I would recommend, I prefer to use a CoinMarketCap API Excel tracker which automatically updates prices and consolidates everything. Excel is still the best and most flexible thing to use by far and you can customize it infinitely to your liking.