http://www.firsttimersonly.com/ by Scott Hanselman + Kent Dodds is an iteration on Scott's http://up-for-grabs.net/

Scott also did a walkthrough several years ago: http://www.hanselman.com/blog/GetInvolvedInOpenSourceTodayHo...

https://www.hanselman.com/blog/BringKindnessBackToOpenSource... is targeted more at maintainers.

There are a great number of additional resources and discussion on those blog posts.

If video is your jam, check out Scott's presentation "Getting Started in Open Source": https://youtu.be/nmiftiGktsU

OT: The icons and banners that constantly hover around the text make it really hard to concentrate on it. Thank god for Firefox' reader mode.

Yeah, this is just unreadably ugly.

Semi-related: I wrote this post [0] to try and motivate people to contribute.

[0] https://dev.to/yelluw/things-you-can-do-to-contribute-to-ope...

Exactly what I needed, thanks Katerina Sand