I don't know what fit the best for you but there are several solutions !

• If you want to keep track of you investment in developpment, then wakatime might be worth looking for
• To keep track of you progresses in your code, you can post your personnal projects on Github (or GitLab)
• And finally, if you just want to keep milestones of what you're learning, etc. sharing it regularly on this awesome website might be a good way too !

Hope it helps !