Does the SEO or Ranking gets effected by changing the text, phrases from the top say to the middle or to the right of the page or so. ?
Yes, but sure to use only text based on keyword you selected for a particular page and targeting the page to get rank.
If the content is strong enough based on keyword rich domains keeping in view the keyword density, it will recover it even if the fluctuation in rankings occur.
search engine robot will read from the top left of any sites. so up to the fact -> make sure the content and the keywords are among the first thing for the robot to read
Definitely if it is quality, unique and keyword rich. Otherwise you efforts will be just a drop in an ocean. Cool mate
only keywords affect ranking, make sure your keywords start at the beginning on each paragraph, also include H1... h6 tags which uses your keywords or phrases. use bold italic or underline on these keywords as well. it is what people widely believed. hopes that help