Bitcoin (abbreviated as BTC) is a digital currency and peer-to-peer payment system (P2P) created by software developers named pseudonym Satoshi Nakamoto. Although proven to be unknown to the general public, Bitcoin has attracted a lot of world financial attention over the past few years.  With this widespread attention, the Bitcoin investment process is easier than ever before. However, it is very important to know that Bitcoin is not an ordinary investment (such as shares) because Bitcoin is a much more unstable commodity, so don't buy before knowing the risks.
Part 1 of 3:
Buy and Sell BTC Edit
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Create a Bitcoin wallet. Today, buying and selling BTC is much easier than before. As a first step, make your Bitcoin wallet. As the name implies, this wallet is a digital account that makes it easy for you to buy, store and sell BTC. Think of it like your universal checking account. However, unlike a checking account, making a Bitcoin wallet is usually less than a minute, can be made via the internet, and is quite easy to do.
In Indonesia, you can visit the Bitcoin.co.id website to make a Bitcoin wallet that is prominent, reliable and user friendly.
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Link your bank account to your Bitcoin wallet. If the wallet has been made, it's time to fill it with BTC. Usually, this is done by providing financial details for the original bank account, such as when creating a PayPal account or registering with another online payment service. Generally, you must provide at least the bank account number, route number (routing) to the account, and the full name according to your bank account. Everything can be seen in your passbook or online bank account. 
Note that you also need to provide contact information, such as a telephone number.
Linking a bank account to a Bitcoin wallet is no more than shopping online. Leading Bitcoin services have high security and encryption standards. Although Bitcoin services were previously attacked by hackers, so are large online shops on the internet.  
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Buy BTC with money from your bank account. if you have provided bank information and have been verified by Bitcoin services, buying BTC to put in your wallet will be easy to do. Usually, on the wallet page there is an option that says "Buy Bitcoin" or something like that. Click this option to enter the BTC purchase transaction process from money in your bank account.
It should be noted that the price of Bitcoin changes from day to day, sometimes the changes are significant. Because Bitcoin is a new type of currency, the market is not stable. Bitcoin exchange rates can be seen on the Bitcoin service site. As of February 11, 2017, 1 BTC is equal to 13,307,500 rupiah. 
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Use BTC to shop at retail that accepts Bitcoin. Lately, the number of businesses that have begun to receive BTC payments has increased. Even though all of these businesses are still a minority, there are big names who have done it. Below is a list of online suppliers that accept BTC: 
If you are market literate or lucky, you can make a profit by buying Bitcoin when the price is low, then buying goods when the BTC value is high so you save money on goods. You can sell these items to take advantage or keep them.
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Selling BTC to other users. Unfortunately, selling BTC is not as easy as buying it. There is no easy way to "cash in" your Bitcoin and save it in a bank account. Instead, you have to find other users who want to buy your BTC using money or goods / services. In general, one of the easiest ways is to register in the Bitcoin market. If you find a buyer, you can complete a transaction through a website, or meet directly with a buyer. To use this method, you usually have to create a seller account and verify your identity in a separate process from making your Bitcoin wallet.
In America, CoinBase and LocalBitcoins are two websites that offer this sales method. In the United Kingdom, BitBargain and Bittylicious are two leading options.
In addition, some sites like Purse.io, allow sellers to give BTC to buyers who then use their own money to buy goods on the internet and send them to sellers. In essence, this is a way to spin using BTCto buy from suppliers that do not accept Bitcoin. 
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Alternatively, sell your BTC on the exchange. Another option for sellers is to use the Bitcoin exchange. These sites work by pairing sellers with prospective buyers. If the buyer has been found, this site functions as an intermediary or testamentary service, which holds funds until both parties have been verified and the transaction is legal. Usually, this service charges a fee. This sales method is usually not instant. In some cases, users even complain that sales with exchange services take longer than other options. 
The Bitcoin Exchange is also available on Bitcoin.co.id.
In addition, some exchanges such as Bitcoinshop allow you to exchange BTC with other digital currencies, for example (Dogecoin and Litecoin).