All the crypto market linked with bitcoin and all other coin if anybody want to purchase need of Bitcoin. Is this right thought of anyone to buy other coin against bitcoin or need to hold bitcoin.
Any thought is right and not wrong, it is his money anyway and so long one can profit, it is right. Both can be profitable if done correctly but buying other coin against bitcoin is riskier though as it's future is more uncertain than btc. Even if that is the case, it is better to do both at the same time, buying other coin while holding a portion of bitcoin one has got for diversity of investments.