So as a woman I would always say obrigada rather than obrigado? Or is it dependant on whether I'm speaking to a man or woman?
yes, you say "obrigada". women say "obrigada" and men say "obrigado".
Common shortenings: -Não, obg -N, obg -N, vlw ("valeu" it is a very very very informal way to "obrigada/o")
Don't answer this way to duo, just some usually abbreviations to help in your msg. bibojonggcbonllm