A good starting point when creating your portfolio is crypto-rating.com website, which presents the cryptocurrency rating by capitalization (the latter is a product of the current cryptocurrency price by the volume of its offer on the market). The simplest and most obvious strategy may be to maintain a portfolio of the ten most valuable cryptocurrencies.
However, it is much better to choose projects which concept is close to you and make them the basis of your investment basket. If, for example, you believe in the importance of the anonymous nature of cryptocurrencies, you can increase the share of Dash, Monero and Zcash in the portfolio. If smart contract technology inspires you, check out Ethereum and Ethereum Classic.
If you are attracted by innovative scaling technologies in payment systems, learn Litecoin and again, Dash. Some cryptocurrencies, such as Ripple or Nem or Bitshares, seem less open and decentralized than, for example, bitcoin and other coins.