I'm a relative newbie, too. I completely agree with what's already been said. Use all the resources available to you, especially forums like this one where there is a great spread and depth of knowledge. There are also a tremendous amount of internet sites that provide specialist knowledge and guides. For example, the RHS website is an invaluable resource.
There are two primary things that I do to help me organise my gardening, and learn about the subject. I have a bookmarks folder in my computer called Garden with a number of sub folders; My Garden Plants, Weeds, Pests and Diseases, Garden Guides, Garden products, Wildlife, Seed Suppliers and many others. Everytime I find a good website or article it goes into the appropriate folder.
The other important thing I do is keep a garden diary and a seed list. The garden diary is organised into sections on maintenance (pruning etc.), and planting/seed sowing. I find this absolutely invaluable as a record of what plants I have year on year, how well they do and when and in what conditions e.g. weather, soil, and position. The section on planting and sowing allows me to check and compare when and where plants get put in the ground and containers, when they germinate etc.
I find it's best to add a little bit to the diary each day, or each time you've been in the garden, although I often break my own rule and find myself struggling a bit to remember several days worth of information to enter in it. Importantly I also take a lot of photo's, for pleasure but also so that I have both a record of how the garden has developed and a visual diary to complement the written one.
I realise that not everyone will have the time to keep a diary but I think it's extremely helpful if you do.
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This is great! I will start a garden diary!!..