Work JOurnal

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Hi all, I am doing a Cert 3 and was have ben very actively involved in daily routines of my center. It struck me that whatever I have been doing will never be noticed by anyone while I am finished working. So I thought of documenting all the work done by me on a monthly basis in order to maintain a record. I have thought of making a scrapbook or a journal. So my question is:
1. Is it a good idea?
2. If anyone has done it before, can you share some ideas or tips with me, please?
Thanks in advance