I guess you could use an exchange, like Coinbase or Blockchain.info, which offer Bitcoin for USD and also manage your wallet for you. There are fees of course. Probably the simplest way to get into it.

Kraken.com is a pretty nice exchange. You can fund your account with USD, EUR and cryptos. Most of the popular cryptos are up for trading at the exchange.

There are limits if you don't officially identify yourself.

One warning: set up two-factor authentication for everything in the security settings. Not only for logging in or trading, but every option.

I think you could use exchange, like in my country we basically use localbitcoin which using p2p puchase or luno.

bittrex and kraken, both the largest markets in cryptocurrency. for ethereum I have no adverse experience, maybe losses in ethereum,buy token deviden that cause wrong investment.

First, specify which country you are as you know that bitcoin is global and some country declared it as illegal so. Usually, every country has its own shenanigans. Normally, people purchase it at an exchange.

bitstamp both bitstamp and bitfinex are fine, both are older exchanges and have a high level of security.

Use bittrex and swipe your credit card dude. Ethereum is good especially if you were able to buy at $35. Personally, I buy bitcoins at coins.ph because that is the only spot where I can score bitcoins straight with my paper trash money. Good luck to you, noobie.

coinbase.com is one of the best exchange website for buying bitcoin. You can also purchase some bitcoins in localbitcoins.com using your fiat money. To your second question, do you mean the overall experience on etherium? Its good when you are a pioneer in having this coin. i just use it for converting my altcoins to eth using exchange.

Well you know... Its different for.. Every..country... You should first state from which country you belong to ..then only can... Everyone give their suggestions.
For example in India.. the safest way to.. buy bitcoins is through an offline wallet called zebpay..ypu do need ypur pan card ,aadhar card, bank account details and address proof for this and when everything is verified and..ypur account is approved you can do many things from there..and one of them is buying bitcoins... They do charge.. for..that.. Also their.. buying and selling rates shows a considerable amount of difference and I don't even know why is that...
And..onto your second question about etherum.. no I have never invested in it nor.. Thought about investing...there are my friends doing that but..I choose..to stick with bitcoins and..I think any alternate cryptocurrencies will just divide my time and attention.

You can buy at your localbitcoins and do meet ups , some seller sells way cheaper than exchanges or online store that offer bitcoin. Also  you can make  sure your bitcoin will arrive and on the spot transaction is always better. But if you still insist on buying online , I prefer remittano they offer escrow service, you just need to pay little fees for their service.