I've never found anything close to the level of detail, for such a range of products as iFixit.
The community has grown significantly since I started using it and I have no problems supporting them through their store.
Whether it be electronics, automobiles or medical equipment, the manufacturers should not be able to horde “oem” parts, render your stuff useless if you repair it with aftermarket parts, or hide schematics of their products.

Summary video by Marques Brownlee
Great channel covering and advocating right to repair, Lewis Rossman
I've never found anything close to the level of detail, for such a range of products as iFixit.
The community has grown significantly since I started using it and I have no problems supporting them through their store.
Asking for general advice here is fine, but if you are looking for specifics then Do It Yourself (DIY) communities would be a better fit:
I’d say ifixit and (sadly) YouTube. Maybe one day we’ll be able to add Lemmy and Peertube to the list🙏
In the decentralised free world:
🗽☯fedia.io/diysolar “DIY Solar”
🥧piefed.blahaj.zone/diy_hrt “DIY HRT”
🥧piefed.social/solarpunk “Solarpunk DIY”
🗽☯krabb.org/c/diy (8/0) “DIY”
🗽☯lemmy.perfecthluxury.store/c/DIY (1/0) “DIY”
🗽☯notdigg.com/c/diy (32/0) “DIY”
🗽☯europe.pub/c/DIY (71/1) “DIY”
🗽☯foros.fediverso.gal/c/maker (58/1) “DIY e Makers”
🗽☯hi-fi.community/c/diy (5/1) “DIY”
🗽☯hilariouschaos.com/c/diy (58/1) “DIY”
🗽☯lemmy.sdf.org/c/synthdiy (192/1) “synthdiy”
🗽☯lemmy.staphup.nl/c/diy_energy (2/1) “DIY wind water energy projects”
🗽☯szmer.info/c/diy (179/1) “DIY, majsterkowanie i takie tam”
🗽☯feddit.uk/c/diy (284/4) “DIY”
🗽☯sopuli.xyz/c/bike_repair_tips (374/29) “Bike Repair Tips and Tricks”
🗽☯slrpnk.net/c/fixing (950/66) “fixing”
🗽☯beehaw.org/c/diy (8518/184) “Do It Yourself”
🗽☯discuss.tchncs.de/c/askelectronics (3901/326) “Ask Electronics”
🗽☯slrpnk.net/c/diy (3792/500) “DIY”
specifically audio:
🗽☯hi-fi.community/c/audiophile (33/1) “Audiophile”
🗽☯lemmygrad.ml/c/audiophile (115/1) “Audiophile”
There are also DIY / fixing communites on these centralised instances which should be avoided if you value digital sovereignty:
hexbear.net, lemmy.blahaj.zone, lemmy.dbzer0.com, lemmy.ml
^ Those are bad nodes simply because they have grown 2 standard deviations above the mean. Thus growing out of control.
The following are the worst of the worst because they are in Cloudflare’s walled garden:
lemm.ee, lemmit.online, lemmy.ca, lemmy.world, lemmynsfw.com, programming.dev, sh.itjust.works, zerobytes.monster
Thanks a lot for the long list! I wasn't aware some fediverse-instances are more decentralised than others. Are you talking about a pure matter of size? Also I have no idea how Cloudflare is a walled garden. Does it somehow hamper the federation? Getting quite off-topic though, but if you'd have some reading on that, we could leave it at that
This page covers CF as a walled garden generally:
W.r.t the fedi, Cloudflare blocks Tor and VPNs by default. So if you wanted to run your own Lemmy node, it would be unable to federate to Cloudflare nodes over Tor or VPNs. Lemmy end users are also oppressed by CF because images come from the source and are not cached. So if someone posts an image on a CF node and I use Tor to connect to slrpnk.net, I can only see the text and not the pics.
Users of CF nodes tend to be ignorant about the exclusivity of many clearnet sites, so they often unwittingly post links to tor-hostile sites.
Are you talking about a pure matter of size?
That too. The fedi is designed to make decentralisation /possible/. But obvisouly if network effect causes a majority of people to pile onto a single host, that’s not decentralised. Lemmy was not designed to be smart about this.
There are several node operators who do not give a shit about decentralisation or the balance that that requires. They just want to have a disproportionate amount of power over users so they can control the narrative through selective censorship. So they grow nodes that are obscenely large. Lemmy World goes to the extreme of using Cloudflare to circumvent the natural control of resource limitations, to grow out of control.
Some non-CF nodes also don’t know when to quit new registrations. I track them by calculating the average node size. If a node has more than 2 standard deviations above the avg number of users, I consider them centralised and avoid posting in their communities, just as I avoid posting in Cloudflare’s walled garden.
The diy Communities on here might be able to help 👍
Which one, for example? You mean on discuss.tchncs.de?
https://slrpnk.net/c/diy?dataType=Post
This one seems to be most active. The one on beehaw seems to be decently active as well.