Paste your sources (one per line). Get an alphabetized reference list, with annotations, or just the formatted citations.
An annotated bibliography is a reference list where every entry is followed by a short paragraph of your own: what the source argues, how sound it is, and why it belongs in your project. The reference above it only has to be correct; the annotation is the part that shows you actually read the source. Paste your sources here, pick a style, and the formatting and the alphabetical order are handled, so your attention can go to the reading.
A descriptive annotation says what the source covers. An evaluative one also says how credible the author is, what the evidence base is, and how the source relates to your argument. That second kind is usually what a brief means when it asks for annotations rather than a plain reference list, so read the wording you were given.
Entries are ordered by the first author's surname and formatted in APA, MLA, Chicago or Harvard. The naming differs too: MLA calls it Works Cited, APA calls it References, and Chicago calls it a Bibliography in its notes system but References in its author-date system, so check which one your brief asks for.
Put one source per line as a URL, a DOI, or a full reference you already have half written. You can switch between a full annotated bibliography and a plain formatted reference list depending on what the assignment wants.
Where a DOI or a matching published record exists, the details are built from that record rather than guessed. Where nothing matches, an entry can come out wrong, and no tool can read a source on your behalf, so treat each annotation as a draft of your own thinking and check it against the source in front of you before you hand it in.
Short: a paragraph, not a page, covering what the source says, how trustworthy it is, and how you will use it. Word counts vary by department, so if your brief sets one, follow it, and if it does not, ask the person marking the work rather than guessing.
A works cited page lists only the sources you quoted or referred to in the text. A bibliography can also include background reading you consulted but never cited. Departments use the terms loosely, so go by what your brief asks for rather than the label.
By the first author's surname, and you keep the author order exactly as printed on the source rather than rearranging the names alphabetically. A work with no named author is filed by its title, ignoring a leading A, An or The.
Yes, you can build an annotated bibliography or a plain reference list for free. A free account saves your work and gives you higher daily limits.