I am new to this system is the only way to raise
BP to raise strength, or can DP be used to buy them?
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The rules as written do not allow for spending DP directly for BP.
When you pay DP to raise your strength, you get more strength, more skilled in strength based skills, more BP, etc.
So, paying DP directly for BP would either
1)cost too much (because you ONLY get BP for the expenditure, or
2)raise the BP too high too quickly (if you make it cheap enough to be worthwhile.)
It's not that you could not do it, but just be aware of what all it will affect if you do.
That's correct! I have a house-rule in my home game at my player's request, as they found magic to be a bit too dominating on the battlefield at higher ranks compared to a fighter type. Each level of fighter adds +2 to BP. That way developing your warrior badassness carries with it some additional physical development for free. As this is just a house-rule, it's not official, so use it only if ya like it :-)