citing from a review I'm writing my first proposal for M.Sc. , meanwhile, I keep reviewing many papers and tracking sources of citation, I noticed that some authors cite from review introduction while others cite from review conclusion. Does it mean that I can cite from any part in review paper as long as the cited information is by the sound of the review author (when he/she doesn't talk about a certain research nor cite from any) wherever it can be found in the review sections ??
thanks
some authors cite from review introduction while others cite from review conclusion. Does it mean that I can cite from any part in review paper...? 


Yes: You can cite any aspect of a paper. Albeit, you should avoid citing a secondary source (i.e., when a paper cites another, cite the original source,* rather than that paper). It is sometimes useful to cite a particular aspect of a paper, e.g., [Section 3, 1] or [Theorem 7, 2], so that readers can find specific aspects of papers to which you are referring.

*Do not cite the original source without sufficient consultation.