There is absolutely zero concensus on these things, within and without the bitcoin community. So, you can chat with people about it, but there are no "canonical" answers to those questions, except to the degree that you can answer them yourself to your own satisfaction.
Intentional inflation and deflation of bitcoin is impossible, but one could imagine the creation of a digital currency where it would be possible.
You don't need to put bitcoins in a bank for "safe keeping," but in a mature bitcoin economy, you'd probably want to invest them in some form, so there would be banks that give out loans. They can't use fractional reserve banking unless they issue their own "notes" (digital or otherwise) that are redeemable for bitcoin. In such a case, there would be no required fractional reserve, unless one were to be instituted by law. Basically, in all these aspects, you can really think of bitcoin as a digital fom of gold. Banks used to hold gold in their vaults and give out redeemable bank notes, so this has happened before historically.
Intentional inflation and deflation of bitcoin is impossible, but one could imagine the creation of a digital currency where it would be possible.
You don't need to put bitcoins in a bank for "safe keeping," but in a mature bitcoin economy, you'd probably want to invest them in some form, so there would be banks that give out loans. They can't use fractional reserve banking unless they issue their own "notes" (digital or otherwise) that are redeemable for bitcoin. In such a case, there would be no required fractional reserve, unless one were to be instituted by law. Basically, in all these aspects, you can really think of bitcoin as a digital fom of gold. Banks used to hold gold in their vaults and give out redeemable bank notes, so this has happened before historically.