JazakAllah khair for turning in your questions this week. Below are the answers to some of your questions by Imam AbdelHameed:
Question: Is it ok to read the Quran (either the actual Book or on a phone app) along with the Imam during tarawih?
Answer: It is better not to hold the Quran while the Imam is leading the Salah because this is something new. Sahabah never done it with Rasool SAW or any Imam after that. So my advice to you is not to hold the Quran while the Imam is leading the Salah because if you do so you are not going to be able to focus that much and you’re going to miss a lot of Sunnahs
Question: If a person arrives for jummah after the khutbah has started, is it ok to still pray Tahiyatul Masjid or any other nafl rakats while the khutbah is in progress?
Answer: Jabir ibn Abdullah narrated that a man came on Friday while Prophet Mohammed SAW was delivering the Khutbah. That man sat down. Prophet Mohammed SAW said to him stand and observe 2 short rakats and then Prophet Mohammed SAW he says when anyone of you comes on Friday while the Imam delivers the khutbah, he should observe 2 short rakats. So the sunnah of Rasool-u-Allah SAW is to make 2 rakats Tahiyatul Masjid even if the Imam is delivering the Khutbah.
Question: Salaam, can you brush your teeth or use a mouthwash without swallowing anything during the fast?
Answer: Yes you may brush your teeth or use mouthwash while fasting but to do it as little as possible.