+, bitcoin is a digital money,currency or fund
The decentralized
+ bitcoin can be transferred from one person to the other through their bitcoin wallet
Only if you are connected to the internet
+, transfer of bitcoin from one wallet to the other can be watched
Unconfirmed transactions are not safe yet and all transaction history is stored permanently and is visible to everyone.
+ there are small mining fee for confirmation of transfer
The fee is charged to the sender and is taken from the total balance.
+every four years the supply of bitcoin to miners is cut by half this is called halving.
Or when it reaches 210,000 block.
+ bitcoin does not promise/ascertain speedy wealth.
and also not as a safe place to save money because the price is volatile.
+your personal/private identity Is guarded using bitcoin -but this can be compromised by other thing one do in connection with bitcoin-
Bitcoin is not anonymous because all transaction data is stored permanently on the network and the users identity can be found if an investigation is carried out on the user by working with crypto-fiat exchanges. "The realm of government".
By the way, you have gathered some information about bitcoin and that is good. I only complete a few of your points based on my knowledge.