As a first approximation:
Meta-analyses and reviews are probably more reliable than single studies. Prefer them. If there are several, check that they agree. A review might be a (text)book, but articles are usually more common. Meta-analyses are probably articles.
(Text)books aimed at researchers and graduate students are the next step.
Particular experimental articles contain the state of the art, but you will need to check if they are reliable with more care than the other sources
To check the reliability of an article, check the methodology, check Pubpeer and consult senior researchers to figure out if there are problems with the articles or if the researchers have a good or a bad reputation, and check if there are several studies claiming similar results.
You might also want to check if the publisher is a known predatory publisher or a reputable scientific publisher, though this is by no means a reliable indicator. Wikipedia pages of publishers are a good place. I might also check the level of the journal in the Finnish Julkaisufoorumi database https://www.tsv.fi/julkaisufoorumi/haku.php?lang=en - it is curated by Finnish scientists. Level 0 journals are not up to the standards, for whatever reasons (e.g. lack of peer review, content is not scientifically interesting), while 1-3 qualify as scientific publications. The database also contains Danish and Norwegian journal levels, where levels 1 and 2 indicate a scientific journal. The level of a journal does not ensure the quality or correctness of the article, but it gives some evidence. Publisher likewise.
Note that it is often difficult to get a definitive answer on whether a source is reliable or not, but if there are too many worrying aspects, best find something else to cite. Also, senior colleagues are an invaluable help, but remember that they might have idiosyncratic opinions, so better ask several.