Developing the tools for probing solar-like oscillators.
I focus on developing the fundamental tools to better characterise stellar properties, particularly for solar-type stars and red giants. My talk is a collection of three parts. Firstly, I introduce a new tool to be implemented in stellar modelling. I prescribe the surface correction, a known type of model uncertainty and conventionally treated with free parameters, to correlate with stellar parameters. The new prescription can effectively reduce the scatter in model-derived ages. Secondly, I discuss how to test the widely used asteroseismic scaling relations for deriving stellar masses and radii. I measure the intrinsic scatter to be a few per cent, using sharp features naturally formed by stellar populations. I also revise and test the systematic offsets of those relations, providing a solid justification for their applications. Thirdly, based on these foundational studies, I illustrate how discoveries can naturally emerge from data with increased precision. I find two new types of post-mass-transfer red giants based on their stellar properties.