There are different ways by which we can obtain bitcoins like Buying on exchange, accepting bitcoin payments or using mining.
based on the three points of choice, which one can you achieve and do at this time?
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That's one thing to consider. "What can you do at the moment?" Do you know how to do any of the options you said? If yes, then you should choose that to obtain bitcoin. Like me for example, the only thing I can do this time is accept btc as payment because I'm part of a signature campaign. And that's how I accumulate such. Surely, others have their own way of earning. Thus, obtaining btc varies from person to person.