AI
What are AI hallucinations, and how do you check an AI answer?
AI hallucinations sound plausible but can be false or inconsistent with supplied information. Learn to check claims, citations and document-based answers.
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Every guide published on Tech Day Book, grouped by section.
12 articles
AI tools explained in plain language
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AI
How to write AI prompts: examples you can actually use
Write clearer AI prompts with three everyday examples, a table for fixing weak answers, and a checklist for checking facts before you use the result.
AI
What are tokens in AI? Examples, limits and costs explained
Understand AI tokens with verified examples, a simple guide to context and usage limits, and a checklist for prompts that are too long.
AI
What is a negative prompt? Examples and support by image tool
A negative prompt tells an image generator what to avoid. Compare tool support, see example prompts, and check what to do when exclusions do not work.
Gadgets: phones, charging, cables and adapters
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Gadgets
Does your phone have wireless charging? Check the exact model
Check your exact phone model for wireless charging, spot exceptions such as Pixel 6a, and separate compatibility from charger or case problems.
Gadgets
Reverse wireless charging: what your phone can actually charge
Check whether your phone can share power wirelessly, which devices can receive it, and why a wireless-charging watch may still need its own charger.
Gadgets
USB-C to USB: Which cable or adapter do you need?
Connecting USB-A and USB-C? Choose the right cable or adapter, compare common setups, and check data speed, charging and video before you buy.
Gadgets
Is wireless charging bad for your battery?
Heat, overnight charging and frequent top-ups explained, with a practical checklist and iPhone and Pixel settings that can help reduce battery wear.
Everyday tech: accounts, security and storage
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Everyday Tech
Why Chrome says your browser is managed by your organization
Understand Chrome’s management message, inspect its policy information and identify the right person to help before changing settings.
Everyday Tech
What does Free up space do in OneDrive? A Windows decision guide
OneDrive’s Free up space makes files online-only while keeping their cloud copies. Compare it with Delete and Always keep on this device, and prepare for offline access.
Everyday Tech
Passkeys vs passwords: the differences and a switching checklist
Passkeys resist fake sign-in pages; passwords can be autofilled. Compare how they work and check device support, recovery and shared-device risks before switching.
Everyday Tech
Who supports passkeys? Five services and the limits to check
Google, Microsoft, PayPal, Amazon Shopping and GitHub support passkeys. Here is where to start, which account limits matter, and what to check before switching.