3. Why is using Bitcoin better than using conventional currencies?
Many thanks to all of you for your explanation.
Bitcoin is better because, for starters Bitcoin isn't centralized or fully controlled by a group of elite bankers and the government. Bitcoin bring transparency to the finance industry and also have other benefits that makes using Bitcoin instead of using fiats recommendable but the banks in collaboration with the government isn't encouraging that because they lose control when we don't give them control over our finances. The government always wants control but when her citizens stop using the institution they provided to secretly monitor the transaction going on in the countries it becomes a problem because it gives the people freedom and that's why Bitcoin is better.
Standard procedure is to create and use a reputable exchange account to buy Bitcoin and send to your very own Bitcoin wallet. You'd want to keep a few things in mind like the entry price and maybe some details specific to the exchange.
To purchase Bitcoin, you don't always need an exchange (speaking about the typical centralized exchanges that we have in the market) as that's how I understand your reply. Bitcoin can always be bought through a decentralized Peer2Peer methods that doesn't involved any of the centralized exchanges. To avoid scam, the buyer just have to be sure he's using the right P2P exchange and one of the popular ones on the forum that anyone here with reputed knowledge will recommend is Bisq or AgoraDesk.com