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is it possible for migrations that previously used wallets on the website and private keys to be used in different Bitcoin wallet applications ?
I had tried but always failed, maybe I was in the wrong stage or I couldn't.
can you explain about this ?
it is not possible for me to explain without having more information. for instance what wallet you used to create that private key and what did you try which failed? was it actually a private key? was the tool you were using to import the key trusted?
there could be a lot of different reasons why you fail in some stages.
In my opinion those wallets are ONLY secure if you are using them for cold storage. If you are using them on a Windows computer with a password then you are better off just keeping on a reputable exchange such as Coinbase using 2FA.
if your computer is infected and you leak anything from your desktop wallet then you will similarly lead your other sensitive data such as your login information and a lot more which could still be used to hack your account even with 2FA because you can not trust any third party.
not to mention that you are giving up control over your keys to a third party and even if you reduce the risk of losing coins to malware,... you are adding another risk that is that third party scamming you or blocking your account, etc.