Apart from the obvious function of acting as a log, whereby you tally your hours, a journal may fulfill several other purposes.
It can act as a motivation. If it’s a public one, then the subtle pressure of living up to your intentions could help to spur you on.
But it’s also a place to record your experiments. What worked; what didn’t? It can help you to discover any patterns to do with mood, plateaus, or progress etc.
You can record the interesting tips and tricks of other people as well as your own.
It can be an organizational centre—a mini-desk as it were.
Keeping a journal may be a keystone habit for you, ensuring that you always sit down at your desk at the same time of day for a few minutes. It can act as a reminder and lead on to achieving other goals.
It could be in the form of a notebook or a blog (which may be private or public.) Some people prefer a vlog. Talk to YouTube. A vlog will capture your speaking ability quite easily and effectively.