Frequently asked questions

Each guide is a downloadable PDF with a defined set of modules — explanations plus C# code examples for each one. The exact modules for every guide are listed on that guide's product page and on the curriculum page.

Length varies by guide, roughly in line with how many modules it covers — the Free Kit is a short starter, while the Quantum Collection bundles all ten guides' worth of content. Module counts are listed on each product page.

All guides are PDF documents — text and code examples, not video. That's a deliberate choice: it's easy to search, easy to copy code from, and easy to read at your own pace.

It depends on the guide. The Free Kit assumes nothing. Every guide after it builds on the modules covered in the guides before it in the sequence — check the "who it's for" section on a product page if you're unsure where to start.

Once you download a guide, it's yours — there's no time limit and no expiring access. See our instant access policy for how delivery works.

We update a guide when something in C# or .NET changes enough to affect it, not on a fixed schedule. Changes are logged on the latest updates page.

After payment is confirmed, you're either redirected to a download page or sent a download link by email, depending on the checkout. Full details are on the instant access policy page.

Yes — every guide is delivered as a PDF file you download and keep. There's nothing to stream and no account required to open it.

No separate app. Because guides are standard PDF files, you can open them in any PDF reader on your phone, tablet, or computer.

Yes. Once a guide is downloaded, you don't need an internet connection to open or read it again.

That depends entirely on how much time you put in and what you're aiming for — we don't make claims about a fixed timeline, since it isn't something we can honestly promise.

Tell us what's not clicking through the contact page. If a guide genuinely doesn't match what its product page described, see our refund policy.

Yes — email support through the contact page for questions about a guide's content or access to it. We don't offer live one-on-one tutoring.

Not currently. Support is handled directly by email rather than through a forum or chat group.

Reach out through the contact page with the guide name and the module you're stuck on, and we'll get back to you.

Yes, in the cases described in our refund policy — for example, if there was an error with your order or a guide didn't match its description.

Payments are handled entirely by a third-party payment provider's secure checkout page. We never see or store your card details on this site.

Yes. Buy the guide and, once you have the download, share it with the recipient yourself, or contact us and we can send it directly to their email instead.

Kastorinemia's guides are written by developers with hands-on experience building applications in C# and .NET. See the about page for more on how the guides are made.

We're a small team of working software developers, not a content agency. We'd rather you judge us on whether the guides are accurate and clear than on a list of titles.