Your Bitcoins are your responsibility. All Bitcoin transactions are irreversible!
There are no physical Bitcoins, only balances kept on a public ledger called Blockchain, and individual Bitcoin Addresses. You can have any number of Bitcoin addresses; one address for storing of large sums of Bitcoins in a paper wallet (cold storage), and another address associated with a hot wallet to keep small amounts of Bitcoins for day to day transactions. Each of your Bitcoin addresses consist of two parts -- a Public Key and a Private Key. These are long strings of letters and numbers. Public key is used to receive Bitcoins into the Bitcoin address while the private key acts as the "key" to that particular Bitcoin address. You can generate public key from the private key, but not the other way around. Therefore, private key has to be kept absolutely safe.
Bitcoin Wallets - Simple & HD wallets
Wallets come in all kinds of flavors and security levels. A software wallet is a computer app or a program that you keep in your PC or mobile phone (mobile wallet) and to which you add Bitcoins for transactions. Web-based wallets too can be thought of as software wallets. Due to the internet connectivity they enjoy, all these wallets are called hot wallets, signifying the risk associated with them.
A wallet can also be classified depending on whether it allows you access to the private keys stored in it (ex. self-hosted wallets). Hosted wallets or web wallets do not offer this facility, and as a result you have to depend 100% on the operator of the service for the security of your private keys.
Hardware wallets for best security
Cold wallets - Paper & Brain wallets and Passphrases
If you don’t own your Private Keys, you don’t own your Bitcoins
What is a Bitcoin Wallet?
4 steps to keeping your Bitcoins safe
Understanding Bitcoin traceability & protecting your privacy
How to make a Bitcoin Paper Wallet?
How to create a 99.99% secure Bitcoin Paper Wallet?
How to send Bitcoins from a Paper Wallet?
Choosing your Bitcoin wallet : Different wallet types and OS's
Best Bitcoin wallet review and comparison - 2017
Top 10 Bitcoin Security And Safety Tips
7 Bitcoin Scams You Need To Be Aware Of
Important: Lessons for newbies on sending (spending) Bitcoins
Using paper wallets and understanding change addresses
A lesson in storage - "Just lost 160 BTC from address managed with blockchain.info"
Bitcoin Transaction Fees
(1) Bitcoin Fee Estimation for a given number of Blocks
(2) Current Fastest and Cheapest Transaction Fees (given as satoshis/byte or BTC/byte):
- This fee is the lowest fee to ensure zero delay, which means the transaction will likely be confirmed with the next Block that could take around 5-15 minutes.
- If you are not in a hurry for an immediate confirmation, you can experiment with a fee lower than this rate. However, dropping the fee below 50% of this rate could cause long delays.
- This is the lowest possible fee to get a transaction confirmed within a few Blocks and within about 30 minutes.
- However, depending on the network congestion, payment confirmation could delay for several hours and up to 10 to 25 Blocks.
- Also please note that any lower fee than this could result in quite unpredictable confirmations that could take far too long.