The best version of DFT, MFMT, was employed to investigate the structure and properties of confined fluids in nanopores with different geometries. This work has two different sections, electrolyte in nanopipet, and non-electrolyte in nanopores with spherical symmetry. In the first section, to solve the electrolyte problem in DFT approach, at first we investigated the behavior of hard sphere fluid inside and around nanopipet pores. Our findings showed that fluid molecules have a strong tendency to accumulate at the conical part of the nanopipte. For the cone region, contact density at the concave wall decreases with the radius of its cross section. A reverse behavior is, however, observed for fluid density at its convex wall. Also, a pronounced maximum peak observed for contact density of fluids in the pore in the junction of two parts of a nanopipet, truncated cone and cylindrical section. Comparison of fluid adsorption in nano-cylindrical with nano truncated cone pores of identical volumes reveals that the cylindrical nanopores record higher adsorption values than conical nanopores for reduced integer values of tip radius. Finally we studied the structure of electrolyte in the nanopipet and investigated the effect of nanopore size and concentration of bulk fluid on it. In the second section of this work, we studied the properties of fluids in the bispherical and spherical nanopores. This section has two parts. In the first part, the effects of structure of fluid on the values of wall pressure and interfacial tension of hard and LJ fluids at the wall of a spherical guest particle were investigated. Results showed that confinement mainly caused oscillations in these parameters around their corresponding bulk values. The amplitude of the oscillations increased with increasing density but with decreasing pore size. Maximum heights of the oscillations were observed for both properties at each density when the pore size was around 2 times in molecular diameter. Moreover, it is found that kind of interactions of the guest particle with the fluid determine the behavior of interfacial tension with guest particle size. In the second part, using statistical thermodynamics and the DFT approach, local normal and tangential pressures are determined for LJ fluids in spherical and bispherical cavities. Both pressure components are observed to exhibit an oscillatory behavior in the sense that their amplitudes increase with increasing density and decreasing cavity size. Also, the values for density and tangential pressure at the concave wall of hard bispherical pores are larger than those at the convex wall. Opposite results are obtained when a strong attraction potential is applied to the convex wall while the concave wall is a hard one. Although these two factors drastically affect the local density, pressures, and their average values, the behavior of the average values of their thermodynamic properties does not depend on them. One aspect of the study involves an investigation of the validity of certain well-known bulk regularities for LJ fluids in spherical and bispherical cavities. These regularities include common compression point, linear relation between pressure and temperature for each isochors, common bulk modulus point, and the Tait-Murnaghan equation. These regularities are studied for both pressure components and their relevant properties. All the four regularities mentioned are found valid for LJ fluids in these cavities.