It's often said - but contributing bug fixes and documentation to projects can be a great 'way in' and lets you get experience delving further into projects that you'd otherwise just 'consume'.
If there are any packages you use a lot - have a look at their github pages and check out the 'Issues' and see if there's anything that you could help with - or if you've used a package and spent time figuring out how some aspect worked that wasn't mentioned in the docs - try making a request to add some helpful docs.
Or even just write a blog post about 'how to do X with package Y' - some day someone will be looking for it on google and you'll save them hours of frustration :-) Same goes for replying to github issues - if you can post a reply for someone who is trying to figure out something you've already done you can help everyone in the future trying to do the same thing.
(I've actually found myself googling for a problem and found a reply I'd posted to github where I'd fixed the exact issue - just totally forgotten it - I buy myself a beer to thank myself ;-)
There's also Hacktoberfest coming up - which can be a really nice place to find projects that need help :-)
[And just to join in the somewhat OT complaints about the search - yeah, it is pretty difficult to use. Very slick visually, but quite hard to find anything of use. I've actually been using the forum way, way less since the last re-design due to the 'mentions' bug as the only way to see if I've had any replies/mentions is to go in manually and check the times on any questions - which is a bit annoying really. Hopefully the new redesign will fix some of this though :-)]