I own 11 - I don't count the stablecoin USDC
I don't own two in the list below, but if I do buy them I will use the Percentage.
9.7% Bitcoin Cash
40.1% Bitcoin
37.8% ETH
1.8% ADA
7.0% Atom
1.0% EOS
1.0% CRV
1.5% Link
2.1% MATIC
1.9% SOL - don't own yet
0.4% VET - don't own yet
0.3% USDC
1.5% DOT
1.1% XLM
Out of all the coins mentioned above the only ones I own bitcoin cash, Bitcoin, Ethereum, Ada, Eos, link, matic, sol and dot. Other coins that I also own are, uniswap, Ltc, ETC and Zil. May seem too many for others but I choose to diversify more. And for the percentage, I do not bother to count. I don't trade that much so I just do random pickings and accumulate more of the one I get to pick. This random pickings happen whenever I get extra budget and so far this worked out quite well for me.