We need a language to read a book, and that affects our thought process, as we start thinking like the author and behave in a manner we perceive from the books. Like how someone speaks under the influence of alcohol, books n authors too influence.
Sawdust that is created from cutting natural wood is safe for your compost no matter what kind of tree the wood comes from. Just make sure the wood has not been treated with any chemicals. Another option with sawdust is to try mixing it in with potting soil.
Is ash good for compost? Yes. Since ashes do not contain nitrogen and will not burn plants, they can be useful in the garden, especially in the compost pile. Wood ash compost can be a valuable source of lime, potassium, and other trace elements. Composting ashes is an ideal way to put them to use in the garden.