I want to know who is eligible to give fatwa in all the schools of thoughts/fiqhs.
as far as i know in SHIA's only marja's can give fatwa.
what is the criteria in all other sects.
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You have to know the detailed teachings of the Qur'an, Prophet S.A.W's Sunnah and Hadith. It is recommended that a scholar come forth with a fatwa as people not qualified in terms of authentic knowledge may only create more and more problems.
In the regard for being authentically knowledgeable, a Mufti or Alim is a preferred person to get a fatwa from. But it is advisable that a fatwa should come from a group of scholars instead of one. One person can be at fault or could make a mistake, but there is less likelihood of a complete group of scholars from making that mistake.
We only take Fatawa from Big Scholars like
May Allah have mercy on them
Other Scholars should acknowledge a scholar that he is a Big Scholar
How they will do it? By knowing his level of knowledge in Qur'an, Hadith and Fiqh.
Check this site: https://islamqa.info/en