Blockchain is the digital and decentralized ledger that records all transactions. Every time someone buys digital coins on a decentralized exchange, sells coins, transfers coins, or buys a good or service with virtual coins, a ledger records that transaction, often in an encrypted fashion, to protect it from cybercriminals. These transactions are also recorded and processed without a third-party provider, which is usually a bank.
The good news: No advanced math or computation is involved. You may have heard that miners are solving difficult mathematical problems--that's not true at all. What they're actually doing is trying to be the first miner to come up with a 64-digit hexadecimal number (a "hash") that is less than or equal to the target hash. It's basically guess work.
Blockchain forms the bedrock for cryptocurrencies like Bitcoin. As we explored earlier, currencies like the U.S. dollar are regulated and verified by a central authority, usually a bank or government. Under the central authority system, a user’s data and currency are technically at the whim of their bank or government. If a user’s bank collapses or they live in a country with an unstable government, the value of their currency may be at risk. These are the worries out of which Bitcoin was borne. By spreading its operations across a network of computers, blockchain allows Bitcoin and other cryptocurrencies to operate without the need for a central authority. This not only reduces risk but also eliminates many of the processing and transaction fees. It also gives those in countries with unstable currencies a more stable currency with more applications and a wider network of individuals and institutions they can do business with, both domestically and internationally (at least, this is the goal.)

Even recent entrants like Uber and AirBnB are threatened by blockchain technology. All you need to do is encode the transactional information for a car ride or an overnight stay, and again you have a perfectly safe way that disrupts the business model of the companies which have just begun to challenge the traditional economy. We are not just cutting out the fee-processing middle man, we are also eliminating the need for the match-making platform.
Bitcoin is a peer-to-peer version of electronic cash that allows payments to be sent directly from one party to another without going through a financial institution. The network timestamps transactions by hashing them into an ongoing chain of hash-based proof-of-work, forming a record that cannot be changed without redoing the proof-of-work. – Satoshi Nakamoto
Bitcoin Core is the “official” Bitcoin client and wallet, though isn’t used by many due to slow speeds and a lack of features. Bitcoin Core, however, is a full node, meaning it helps verify and transmit other Bitcoin transactions across the network and stores a copy of the entire blockchain. This offers better privacy since Core doesn’t have to rely on data from external servers or other peers on the network. Bitcoin Core routed through Tor is considered one of the best ways to use Bitcoin privately.

When you have your wallet, go to a section that says 'Receive Money' or 'Add funds' or something similar. There will usually be a QR-code that has your Bitcoin address encoded in it. Print out the image with the QR-code and place it next to your cash register. Your customers will typically have a Bitcoin app installed on their smartphone where they can enter the value of the purchase in USD or EUR. Their app calculates the corresponding Bitcoin value. It automatically takes the current exchange rate to get the right amount. On your wallet account you can check the confirmation of your incoming payment.
Network nodes can validate transactions, add them to their copy of the ledger, and then broadcast these ledger additions to other nodes. To achieve independent verification of the chain of ownership each network node stores its own copy of the blockchain.[68] About every 10 minutes, a new group of accepted transactions, called a block, is created, added to the blockchain, and quickly published to all nodes, without requiring central oversight. This allows bitcoin software to determine when a particular bitcoin was spent, which is needed to prevent double-spending. A conventional ledger records the transfers of actual bills or promissory notes that exist apart from it, but the blockchain is the only place that bitcoins can be said to exist in the form of unspent outputs of transactions.[3]:ch. 5
Pls I have 1500$ which I want to invest in bitcoin but I don’t have any idea about it, how to start? Where to start? What you supposed to do?. I live in a country Ghana, where we are yet to have a legislative instruments on crypto currency. Also, I will like to know after learning how to trade in bitcoin, will I be pay with money directly which I can make easy cash out bcoz we don’t have any legislative instruments yet.
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Blocks on the blockchain store data about monetary transactions — we’ve got that out of the way. But it turns out that blockchain is actually a pretty reliable way of storing data about other types of transactions, as well. In fact, blockchain technology can be used to store data about property exchanges, stops in a supply chain, and even votes for a candidate.
Lend directly to someone you know. This allows you to assess personally, whether you regard the borrower as trustworthy. Then the two of you only need to agree on the terms like duration and interest rate and off you go. The drawback is, however, that you probably will not have too many acquaintances who match your amount, duration and interest rate requirements. But it's a nice way to earn Bitcoins.

Bitcoin has been criticized for the amount of electricity consumed by mining. As of 2015, The Economist estimated that even if all miners used modern facilities, the combined electricity consumption would be 166.7 megawatts (1.46 terawatt-hours per year).[130] At the end of 2017, the global bitcoin mining activity was estimated to consume between one and four gigawatts of electricity.[199] Politico noted that the even high-end estimates of bitcoin's total consumption levels amount to only about 6% of the total power consumed by the global banking sector, and even if bitcoin's consumption levels increased 100 fold from today's levels, bitcoin's consumption would still only amount to about 2% of global power consumption.[200]
Although Bitcoin is homogenous (the same everywhere in the world), its price varies across countries and even exchanges within the same country, giving a rise to arbitrage opportunities. At one point in 2017, the Bitcoin price in South Korea was trading at a 35% premium and in India, a 20% to 25% premium. The demand and supply conditions result in some aberrations in its price.

In 2014, prices started at $770 and fell to $314 for the year.[32] In February 2014 the Mt. Gox exchange, the largest bitcoin exchange at the time, said that 850,000 bitcoins had been stolen from its customers, amounting to almost $500 million. Bitcoin's price fell by almost half, from $867 to $439 (a 49% drop). Prices remained low until late 2016.[citation needed]