The recent discovery of spin qubits in hexagonal boron nitride (hBN), a two-dimensional (2D) van der Waals (vdW) material, has opened up exciting possibilities for quantum sensing. Owing to its layered structure, hBN can be easily exfoliated and integrated with various materials and nanostructures for in-situ quantum sensing. In this talk, I will provide a brief overview of recent advancements in quantum sensing and imaging using spin defects in hBN and discuss our contributions to this emerging field. We have demonstrated high-contrast plasmon-enhanced spin defects in hBN for quantum sensing [Nano Letters 21, 7708 (2021)] and investigated their excited-state spin resonance. Additionally, we achieved optical polarization and coherent control of nuclear spins in hBN at room temperature [Nature Materials 21, 1024 (2022); Nature Communications 15, 104 (2024)], paving the way for manipulating nuclear spins in vdW materials for quantum information science and technology applications. Recently, we observed optically active single spin defects in boron nitride nanotubes (BNNT), a one-dimensional (1D) vdW material [arXiv:2310.02709]. We have developed a method to deterministically transfer a BNNT onto a cantilever and use it to demonstrate scanning probe magnetometry.