Straight answers about the hardware and formats you already own
Explanations of the standards behind home networking, TV and audio, and file formats. Written to be correct rather than long, with sources on every article.
Home network and Wi-Fi
Wi-Fi standards, bands, coverage and the diagnostics that actually narrow down a slow connection.
2.4 GHz vs 5 GHz vs 6 GHz: which band for which device
How to split devices across 2.4, 5 and 6 GHz: real path loss numbers, the DFS stability tax, 6 GHz power caps, and the band steering setting that breaks IoT.
DNS explained, and whether changing your resolver helps
How DNS resolution, TTL and caching really work, why a faster resolver almost never speeds up browsing, and the three reasons that do justify switching.
Double NAT and CGNAT: how to tell which you have, and what actually breaks
Your router's WAN IP settles it: an RFC 1918 address means home-side double NAT, 100.64.0.0/10 means ISP CGNAT. Here is what each breaks and what fixes it.
Ethernet cable categories: Cat5e through Cat8, and what you need
Cat5e carries Gigabit and 2.5 Gbps at 100 meters, Cat6A is the honest upgrade for a wall run, and Cat8 stops at 30 meters for speeds no home device reaches.
Guest networks and keeping smart home gear off your main LAN
A guest SSID is a firmware convenience, not a security boundary. How client isolation, a second subnet and an 802.1Q VLAN differ, and what each one breaks.
IPv6 at home: what changes and what to do about it
IPv6 gives every device a routable address and retires NAT, but routable is not the same as reachable. What changes on a home line, and what to check.
Mesh vs range extender vs powerline: an honest comparison
Extenders halve throughput on a shared radio, mesh only escapes that with a dedicated backhaul or a cable, and powerline speed depends on your house wiring.
Port forwarding and UPnP: how they work and what they expose
A forwarded port is a permanent NAT rule that accepts anyone. UPnP lets any device on your LAN write one with no password. Here is what that costs you.
Router, modem and gateway: what each one actually does
A modem converts the line signal, a router forwards packets, and NAT and DHCP are separate jobs on top. What bridge mode changes, and why double NAT happens.
Why your Wi-Fi is slow: a diagnostic order of operations
Diagnose slow Wi-Fi in cost order, starting with a wired baseline test and ending with new hardware, so you only spend money once you have proof.
Wi-Fi 6 vs Wi-Fi 6E vs Wi-Fi 7
Wi-Fi 6E is just Wi-Fi 6 on the 6 GHz band and Wi-Fi 7 adds 320 MHz channels plus MLO, but spectrum rules and your broadband plan decide the rest.
Wi-Fi security: WPA2, WPA3 and what actually protects you
WPA2 hands attackers a capturable handshake to crack offline. WPA3's SAE removes it, but transition mode gives the hole back. What to set and why.
TV, audio and streaming
HDMI, HDR, TV audio return channels and what streaming quality really depends on.
ARC vs eARC: getting sound out of your TV correctly
ARC tops out at compressed 5.1 while eARC carries 37 Mbps of uncompressed audio, so lossless Dolby Atmos needs eARC, the labeled port and the right cable.
Dolby Atmos and surround sound formats, decoded
Why Dolby Atmos is metadata inside TrueHD or Dolby Digital Plus, what the third number in 5.1.2 tells you, how DTS:X compares, and what virtual height does.
HDMI 2.0 vs 2.1: when the cable actually matters
HDMI 2.0 tops out at 18 Gbps and HDMI 2.1 at 48 Gbps, but every 2.1 feature is optional, so only Ultra High Speed cable certification guarantees anything.
HDMI-CEC: one remote, many brand names, and why it half works
HDMI-CEC is a slow control bus on pin 13, sold under 22 trade names. What it does on the wire, how it fails, and which device to disable first.
HDR formats explained: HDR10, HDR10+, Dolby Vision and HLG
HDR10 sends one tone-mapping curve per film, HDR10+ and Dolby Vision send one per scene, and HLG sends none, but your TV's brightness matters more.
How much internet speed streaming actually needs
Netflix asks 15 Mbps for 4K, Apple 25, Max 50+. Here is what every major service actually publishes, and why buffering is usually latency instead.
OLED, QLED and Mini LED: how the panel types actually differ
OLED is emissive and needs no backlight, while QLED is a quantum dot film and Mini LED is a backlight, so both are LCD upgrades and not panel types.
Refresh rate, VRR and motion smoothing: what the Hz number hides
Motion Rate 120 usually means a 60Hz panel. How native refresh, VRR, ALLM and frame interpolation actually work, and what a PS5 or Xbox really needs.
Soundbar or AV receiver: which one you actually need
A receiver buys discrete amplified channels, six or seven HDMI inputs and multi-position room correction. A soundbar buys one cable. Which one fits you.
Speaker and subwoofer placement that measurably helps
Where the speakers and the subwoofer sit outranks every setting on the receiver. The 60 degree triangle, toe-in, reflection points, and the sub crawl.
TV size and viewing distance: when resolution stops mattering
Work out the exact distance where 4K stops being visible on your TV, using the ITU's own viewing-distance table, plus the honest answer on 8K.
The TV picture settings that actually matter
What picture mode, color temperature, sharpness, local dimming and HDR tone mapping really do, and why the factory showroom preset is wrong at home.
Files, formats and backups
Codecs, image formats, backup strategy and moving large files around without losing them.
Cloud storage versus a NAS: the honest cost comparison
Verified July 2026 prices per TB per year for B2, Wasabi, iDrive e2, R2, iCloud and Microsoft 365, set against NAS power draw and real break-even in years.
Data recovery: what works, what makes it worse
Why stopping every write matters most, how TRIM makes SSD deletion permanent, when DIY recovery software is safe to run, and what a clean-room lab costs.
Encrypting drives and files: BitLocker, FileVault, LUKS and VeraCrypt
Disk encryption protects a laptop that is powered off, not one you are logged into. What BitLocker, FileVault, LUKS and VeraCrypt cost you in access risk.
JPEG, PNG, WebP, AVIF and HEIC: which format when
AVIF for web photos with a JPEG fallback, PNG for screenshots, WebP if you want one format, and HEIC only inside Apple, because no other browser reads it.
NTFS, exFAT, APFS and ext4: which file system for which drive
exFAT is the only format current Windows, macOS and Linux all mount read-write, which is why it wins for shared drives. NTFS, ext4 and APFS compared.
Password managers and two-factor authentication, practically
The July 2025 NIST rules changed what a password must be, SMS is the standard's one restricted authenticator, and how to get back in if you lose a key.
Photo metadata and organizing a library that survives
Exif, IPTC and XMP each hold different things. Why photo dates break when you copy or convert files, and how to build a library that outlives the app.
SSD vs HDD: speed, endurance, and how drives actually fail
SSD endurance ratings, hard drive failure rates, the SMART values worth watching, and why an SSD is the wrong place to park data you plan to power off.
Sending large files: the practical options compared
Real size ceilings and expiry windows for email, WeTransfer, Dropbox Transfer, cloud drives and self-hosted tools, plus which ones actually encrypt.
The 3-2-1 backup rule, applied to a normal household
Three copies, two media, one off-site, plus why sync and RAID are neither. Real retention windows, 2026 storage prices and a plan that costs $99 a year.
USB standards decoded: the speeds behind the marketing names
USB-IF now recommends just five consumer speed names, USB 5Gbps up to USB 80Gbps. Here is what USB4, Thunderbolt and a plain USB-C cable really guarantee.
Video formats and codecs: MP4, MKV, H.264, H.265 and AV1
MP4 and MKV are containers, H.264 and AV1 are codecs inside them, and hardware decode support rather than the file extension decides whether a video plays.