Double weighted sum involving $\mathrm{GL}(2)$ Fourier coefficients

This article proves non-trivial estimates for a bilinear sum involving the Fourier coefficients of a Hecke-holomorphic or Hecke-Maass cusp form for $\mathrm{SL}(2,\mathbb{Z})$.

As corollaries, we draw interesting results related to non-trivial bounds of different shifted convolution sums and summatory functions.