Talmud: Berachot 2

I just now listened to your class on talmud brachot and you are amazing ! i hope to maybe learn torah every day. my question to you is i am confused at the times of each opinion at the end of your class. can you clarify mishekidush shabbat is shkiah ben hashmashot tseit or after tseit. if after tseit how long after tseit is it. also mishehaani ochel pito bimelech is what time exactly. lastly if mikvah is kiheref ayin how can the kohen go to mikvah and what hour is it that the kohen goes to mikvah to daven kriat shma. i anxiously await your answer to my questions.and afterwards hope to review your entire class of brachot page 2. thank you so much Reply

please guide, how to put subtitles in video. thank a lot Reply