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
Having a big part for bitcoin and ethereum is a good choice. You can invest in any altcoin that you think and it's a long road for you if you'll add more to both of them but the priority is bitcoin.
USDC isn't counted but if you happen to own it, I think that you're converting some profits on it so that you can buy back whenever a coin you've sold drops.