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Over the past two decades, the realm of dusty, star-forming galaxies (DSFGs) has changed our understanding of the cosmic star formation embedded in the dust, thanks to the combination of space and ground-based IR and millimetre telescopes. Meanwhile, with the new advance of JWST, we have come to another new era to study statistical properties and internal structures of DSFGs. During my talk, I will go through the observations of different scales of DSFGs and discuss the new opportunities to explore the early Universe with DSFGs. I will start with the large sky surveys for DSFGs, particularly focused on the ALMACAL sky survey, which has turned ALMA into a survey machine by utilising all the calibration observations. I will present our recent efforts on the multi-band survey for DSFGs and ongoing projects. After that, I will introduce several new opportunities to understand the interstellar medium of the DSFGs, especially on the initial mass function and the magnetic fields. In the last part, I will discuss the clustering properties of DSFGs and their connections to the cosmic web and present-day galaxy clusters. I will also discuss possible collaborations with local experts from ASIAA.