This will depend on which country you came from because here in my country we can easily buy bitcoins in many ways, I think the best that you can do is to make some research in which you can buy bitcoin using a credit card in you're country.

I buy btc in the safe places after I check the credibility of the seller. I hold coins now and I think that btc is the best crypto which will be successful for the long period of time

You can buy bitcoin by using exchange bitcoin have legal at your country and support using bank account, my country have exchange have work with bank to make deposit and withdrawal our balance at exchange account.

There are quite a few different ways but none are particularly easy. Coinbase is good for newbies, but it requires a tricky know your company procedure before you can buy any

coinbase anywhere location or states do you stay you use coinbase to buy bitcoin but not to sell bitcoin converting into fiat money, or you choose bittrex and poloniex both are secured exchange the one of the most pioneer exchange in crypto aside from coinbase.

Me personally only buy my bitcoin at localbitcoin as that the only one i can trust by so far. i already use it for 3 year now without any problem come up and their support also fast solving my small matter when i have some doubt on buying and selling. So A++ for localbitcoin so far and you should try it also.

I usually buy cryptocurrency through CoinSwitch.co. You can buy multiple cryptocurrencies on this platform using credit card. Sharing the link for your reference.
https://coinswitch.co/coins/bitcoin/buy-bitcoin-worldwide.  

I haven't bought Bitcoin for a long time: been earning

Blockchain and coinbase is one the best options to buy bitcoin I usually like to buy my bitcoin from this two trustworthy place. You can buy from them these two are very safe and reliable.