With the hard fork approaching I saw bitcoin.org suggests to shun away from the hard fork adopters such as coinbase, blockchain and xapo? Any good online wallet to use?
Does anyone know those which online wallet those big exchanges such as bitstamp, kraken, bitffinex use? Do they use 3rd party hot wallet or they are using their own proprietary online wallet?
Don't use a web wallet, period. Sure you can find some that actually allow you to hold your own private keys but usually, what you'll find is that either there is a difficulty in exporting the private keys when you need it since they don't support one fork or another or that they just don't give you access to it at all.
Use electrum, it's a small download and it's fast and safe.
Unless you can't download software for whatever reason, then use wallets on bitcoin.org that are listed as you being in full control.