"I drink tea."
Translation:मैं चाय पीती हूँ।
I feel like there should be an indication of that in the sentence, no? Like "I (f.) drink tea."
Both piithaa "पीता" and piithii "पीती" are right for this one as the subject is not mentioned.
Depends on how is your keyboard. in transliteraded hindi keyboard, you write "main"
Regarding your phisical keyboard, you can install keyboard layouts in your system, and change it usually from the windows bar when you require it.
I'm using macos now, but it should be a transliterated hindi keyboard layout in windows too.
I don't know your windows version but you can check it here, maybe it helps. https://www.online-tech-tips.com/computer-tips/change-keyboard-language-in-windows/
I don't know how to write the bindu in a traditional hindi keyboard, i only know with transliterated. If that is your question... :-) maybe someone else can help you with that.