Answers

One question, answered the whole way through, with the arithmetic actually done rather than named. Every one of them ends at the page of a course that carries it further, because an answer you cannot build on is a fact you will look up again next month.

What gets asked about

Where most people start

Where should a session ID be stored so JavaScript can't read it?Store it in an HttpOnly cookie set by the server; that is the only browser storage JavaScript running on the page cannot read.
Why does the model get stuck repeating the same sentence over and over?The model is not stuck in a memory loop: once it has written a phrase, that phrase is in its context and makes writing it again more likely, so a decoder that always picks the top word cannot leave.
Why does the model return JSON wrapped in extra text when I asked for JSON?A request for JSON does not force the model to return only JSON, so you need to validate the reply and repair it once rather than assume it will parse.
Why is the date off by one day after I save it and read it back?You saved a calendar date as if it were a precise moment, so showing it in another time zone can move it to the day before or after.
Why does diffusion add Gaussian noise instead of any random corruption?Diffusion adds Gaussian noise because Gaussian errors combine exactly: each step keeps the spread fixed and gives a closed-form noisy picture at any later step, which makes the reverse step learnable.
What is the difference between variance and standard deviation?They measure the same spread: variance is the average squared distance from the mean, standard deviation is its square root, so you report the standard deviation and calculate with the variance.
How do you make a vague claim precise enough to tell whether it's true?Fix what is being talked about, what is asserted, which cases are covered and the cut-off, then name an observation that would prove it false.
How do you find the parabola that best fits a function near a point?Match the function's height, slope and bending at the chosen point; those three conditions single out exactly one parabola.

If you want the whole thing

Behind every answer here is a course that works through its subject from the beginning, with problems under each idea and a reason rather than a tick when one is marked. An answer settles the question you came with; the course is what makes the next one easier.

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