In my codebase I often leave comments in the form of // TODO: thing to get done. I need a way to find them across all my files and view them in one place. I am open to plugins but would equally want to know what can be done in vim.
If you're using nvim, then one plugin to try is Telescope. From there you can use :Telescope live_grep and simply searching TODO will yield all results of TODO comments across your codebase.