For example here are some to look at:
1. INFRASTRUCTURE COINS such as ETH, BTC, VEN, WAN, STRATIS, NEROCHAIN, PCHAIN, STELLAR etc. These are actual blockchains where other dapps and applications, smart contracts etc are built upon. These I listed are just some examples, there are tons more to look at.
2. PRIVACY COINS like Monero, ONION etc which have layers of more privacy in their transactions.
3. EXCHANGE TOKENS like BINANCE, HUOBI, COBINHOOD, COSS, TRADE.IO, IDEX these exchanges have their own tokens, SOME ARE CENTRALIZED EXCHANGES, SOME ARE DECENTRALIZED ETC
4. infrastructure for mass adoption TOKENS/COINS SUCH AS TENEX, MONACO, PUNDI X which want to help buying/selling stuff with crypto much easier for the General public.
These are just some of the niches you can look into and find the best that suits you in each niche.
YOU CAN CHECK OUT ALSO ico sites like ICOBENCH, ICO DROPS, COINSCHEDULE etc to find out about new ICOS as well.
This is very detailed to and concise. Investments in various classes of coin is very vital. I'd personally add EXCHANGE TOKENS such as COINEX (CEX), BIBOX (BIX) to the list as these very good coins that have given good returns in recent past and they're exchanges with high liquidity.