Well written and well explained too, but regarding hardware wallets, you should include (I guess) some products of ledgerwallet like the nano blue and for the software wallet samourai wallet is nice too, there are many positive feedbacks for this wallet.
1) Are hardware wallets allowed on every exchange. I mean I am not using any international exchange but the exchanges available in my country. I do not see any option there to store in physical wallet. I tried searching for tutorials but there is nothing for the specific exchange.
Yes, hardware wallets are allowed on any exchange you are only sending cryptocurrencies to the wallet address of the exchange or vice versa and there's nothing to do when sending to any wallet, international exchange or local.
2) If someone steals that physical wallet and I have not written the details, I will not be able to access the coins. Right ?
Of course, yes. Once the hardware wallet breaks, steal or lost and you don't have written or save the backup of it then there's no way to recover your funds on that hardware wallet that's why most wallet has an alert to backup the recovery phrase first when using in any type of wallet.
And addition for blockchain.info disadvantages, the wallet is full of bugs.