Four things I know better than most
Pick your interest and I'll point you straight to the best content and the gear worth buying.
This isn't a content farm.
It's one person's obsession.
I've worked in electronics for nearly 30 years and at various points I've owned nearly every home computer and games console you can think of. It started with a Sinclair ZX81 and honestly, it never really stopped.
Every recommendation on this site is researched and checked against trusted sources. When I say something is worth buying, it's because I'd buy it again. When I say avoid something, it's because I've made that mistake so you don't have to.
Latest from the lab

Dreamcast Not Reading Discs? Fixes in Order, Cheapest First
Why a Sega Dreamcast stops reading discs and how to fix it in order of cost: the lid switch, disc and MIL-CD checks, lens cleaning, the cracked spur gear, GD-ROM board capacitors, and the laser potentiometer adjustment as a last resort.

Game Gear Recap Guide: Capacitor Lists and Common Mistakes
A Sega Game Gear recap guide: how to identify your board revision, the capacitor list for the VA1 main, sound and power boards, how to remove leaking caps without lifting pads, and how to fix no sound or a white screen after a recap.

Game Boy No Sound? How to Fix It on Every Model (DMG to SP)
How to fix a Game Boy with no sound from the speaker: the headphone-jack mute switch, the volume wheel, the speaker and the audio capacitors, model by model for the original DMG, Pocket, Color, Advance and SP.

N64 Loose Joystick Fix: Regrease, Rebuild or Replace?
Why N64 controller sticks go loose, why you cannot really tighten one, and the three fixes that work: regrease, new gears and bowl, or a drop-in hall-effect or TMR module. Includes the screws, the 6-pin connector and the re-zero trick.

N64 Powers On but No Display? How to Fix the Black Screen
How to fix a Nintendo 64 that powers on with the red light but shows a black screen: Jumper Pak, cartridge and region lockout, TV input and cables, the 12 V and 5 V rails, the Multi Out socket and when it really is the board.

GameCube “The Disc Could Not Be Read” Error: How to Fix It
How to fix a GameCube that shows "The disc could not be read" or drops to the memory card menu: disc checks, lens cleaning, the VR-401 laser trim pot, drive-board capacitors, the ribbon cable and when to fit an optical drive emulator.