A very short list of words I seem to have randomly learned without trying from double-language subtitles:
It means "yes", and "to be", and "so be it" although most of the time in historicals it actually means "aye, aye, Sir".
It means "fine", "okay", "alright", and "good", or quite often it actually seems to mean "if you say so". I kind of like the character for this one because the pictographic definition of "good, fine, okay" is a woman with a baby.
it means "thank you very much". This goes in the box called "I don't know if this is something people normally say, or if it's only for historicals". In award shows people say 谢谢 xièxie.
Recognising some forms of address is really useful for getting hints of what's going on that the subtitles don't give you. These include didi, or a vocative a-die, which mean "younger brother", jiejie and a-jie which mean "older sister", and furen and fu(jun? not sure of the second syllable) for "wife" and "husband", specifically when they are contrasted with some other option that could be used.
For instance I am pretty sure that in this line, below, 妹妹 mèimei "younger sister" is being used to be pretentious, presumptuous, and ingratiating in a really specific and rather funny way which the subtitle doesn't attempt to translate:
I recognised it by ear and then wound back to check the subtitle.
I also discovered that addressing your husband by his actual full name (not Surname + Courtesy Name but Surname + Name) apparently has precisely the same meaning as the equivalent in English, namely "you're ANNOYING me!"
This show is pretty entertaining