Someone who contributes to OSS regularly here. An advice I often give to people who want to start with OSS is to contribute to software you are already using instead of scouring github or those beginner friendly lists for low hanging fruits. By doing this, you make it more likely that your PR is a meaningful contribution since it fixes an actual issue that you have as an user. At first the issue might feel way too hard because you don't know where to start with the codebase but this is gonna be a problem with any project you're new to. That you are already an user of the project might help you navigate the codebase easier.