Saving Bitcoin in a wallet for a long time is there any risk? while for long-term investment I have to keep it in my wallet. Please advise...
Yes it will be risky if you will store them in some of the centralized bitcoin wallet like coinbase and xapo.
Either use paper wallet or hardware wallet like trezor, ledger to store your bitcoin for long term, we have seen many scam bitcoin web wallets before so be careful when choosing web wallets to use as hot wallet.