It depends a lot on the setup you have, how many people, release flow etc. Issue tracking depends on the kind of software you do and whether you want a programmer-only flow or a full support flow.

Deploy pipelines will usually depend on the infrastructure, cloud solutions usually can integrate with several and there's also common solutions and even FOSS ones, like Terraform vs OpenTofu.

Git frontends are a very mixed bag, generally speaking their main purpose is to hide Git as much as possible and allow programmers to contribute changes upstream without knowing much beyond the nebulous "PR" concept. Basically they're mostly useless other than enabling people to remain dumb. A good Git tutorial and a good history visualization tool (git happens to include one called gitk out of the box) will do so much more to teach people Git, and there's really no substitute for communication – using annotations to discuss pros and cons for a PR is badly inadequate.

Forgejo should work