also is it ok to recite fatiha with imam or is it better to read the fatiha after the imam has read
Q 2: If a person joins the congregational Salah while the Imam is reciting Qur'an after Al-Fatihah in any loudly recited Salah (Prayer) such as Maghrib prayer, should this person recite Al-Fatihah first or not, as Allah (May He be Exalted) says: Surah Al-A`raf, 7: 204 So, when the Qur’ân is recited, listen to it, and be silent And if the person joins the Imam while he is still standing, and then as the person starts to recite (The Ayah) Al-Hamdulillah Rab-il-`Alamin, the Imam offers Takbir (for Ruku`[Prostration]), should the person follow the Imam or complete recitation to the end of Al-Fatihah?
A: Reciting Al-Fatihah is obligatory for the Imam, the person praying alone and the Ma'mum (person led in prayer) in Jahr (out loud) or Secretly pronounced prayers, due to the general evidence of reciting Al-Fatihah in Salah. Whoever joins the congregational Salah and offers Takbir with the Imam should recite it (Al-Fatihah), but if the Imam offers Ruku` before the person completes its recitation, they should follow the Imam and in this case, and the Rak`ah will suffice them. Besides, whoever fully catches up with the Imam in a state of Ruku`, this will also suffice them and they are not obliged to read Al-Fatihah according to the most correct opinion of Scholars. In this case, reciting Al-Fatihah is not obligatory as a person will not be able to recite it. This is because of the famous Hadith
( Part No : 6, Page No: 386)
of Abi Bakrah that is narrated in Sahih Al-Bukhari .
May Allah grant us success! May peace and blessings be upon our Prophet Muhammad, his family, and companions!
Permanent Committee for Scholarly Research and Ifta'
source
and as for >>if by mistake i start the salah before Imam, wht should i do?
If you are at home su should go to the misjid if it is close that is a must on a muslim man we (brothers) are obligated to offer salah in misjid if it is close if it isnt then countiune ur pray u dont have to wait for imam if u mean at misjid stop and start again with imam.
the Prophet (peace be upon him) instructed, saying, “When he (the Imam) recites (the Qur’an), listen attentively.” The Prophet (peace be upon him) also said, “Perhaps you recite behind your Imam?” We (the Companions) said, “Yes, it is so, O Messenger of Allah.” He (peace be upon him) said, “Do not do that except with Fatiha-tul-Kitab (the Opening of the Book, i.e. Al-Fatihah); for there is no Salah (prayer) for the one who does not recite it.”
the Prophet (peace be upon him): "Whoever heard the call (adhan) and he did not come to it (the prayer), then there is no prayer for him except with an excuse”. It was said to Ibn `Abbas (may Allah be pleased with them), 'What is a legal excuse?' He said, 'Fear or disease'.