Roadmap document contains some notes and ideas on what can be done to improve the project. Those may be not very clear, that's how OSS ideas start.
Another good source of small tasks is to search through code for TODO and FIXME comments.
Raise the question in Slack about particular item that attracked your attention to get more explanation.
You will need Golang 1.20+ and NodeJS 18+. Also, you will need a working Kubernetes cluster with Crossplane Helm chart installed into it. It is advisable to apply example Crossplane objects from examples folder.
First you need to build frontend (the API backend won't compile without that). To do so, run npm run build inside pkg/frontend directory.
To build API backend, run go build -o bin/komoplane . in the project root. Alternatively, you can download and run API backend from latest release.
For frontend development, start API backend with command bin/komoplane, then run npm run dev inside pkg/frontend. Open the suggested URL in your browser.
You can then restart/debug backend without restarting frontend.