Your Crypto portfolio is the collections of all you crypto assets, these include Coins, Tokens, and NFT's .
The "Crypto tracking websites" mentioned above are site on the internet (also mobile app's) the you can manually add transactions from your portfolio, this can help you see all prices on all your coins/tokens from perhaps a multitude of wallets at once.
CoinMarketCap VS CoinGecko
CoinMarketCap (CMC) and CoinGecko are the 2 biggest crypto tracking websites out there,