no pro at this but whatever text you read through youre bound to pick up at least some metaphor, high modality, cumulative listing, hyperbole, statistic, colloquial language, rhetorical question, intertextual references and all that but i guess discussing the form and purpose also helps e.g if its a review its meant to critique and you enforce how and why and for an article which are mostly discursive in nature rely upon the author's personal experiences --> anecdotal and what not i hope theyre not making you analyse informative texts cause??? why on earth
i guess other significant points would be the rhetorical triangle which talks about logos (statistics/evidence), pathos (emotional appeal/effect) and ethos (ethics/credibility of the speaker & if theyre valid for their claim/have the right to back it e.g by a certified authority i just think of it as experience and background of the author like if theyre talking about a culturally significant issue and they are from that background thats an ethos check for me)
other things i would spot for would be the narrative voice/pov since theyre quite prominent and significant to the form type & intention like speeches which can alternate between all voices or an article can be first person and intimate plus since articles basically have no rule (if you pull one off the internet like some blogpost lmfao) they could syntax questionably, format or stylise text intentionally but i feel these last points are more of a technical thing rather than anything literary
in general just find whatever techniques you normally would if its not a non-fiction and yeah.....maybe some links would help
link1 link2 link3 link4 link5 link6 link7 i think its kinda repetitive ngl but you should probably look for samples as reference perhaps