I've made some gains in the stock market and want to buy some crypto. I currently buy on Shakepay and Hold on blockchain, I wrote down my walled ID. Am I missing anything ? I've read that you should keep your crypto in a wallet which is why I chose Blockchain, is it a good choice ? And do I only need to remember my walled ID if I ever lose my computer or phone and don't have access to blockchain ? I haven't found a Blockchain subreddit and I am mostly intrested in holding ETH.