I use black tourmaline, rose quartz and amethyst regularly but make sure to clear them regularly.
I use crystals for meditation like breathing exercises, tapping into my intuition, setting intentions and manifesting. You can create crystal grids to manifest your desires like love, money and career.
I like using selenite for energy clearing, absorbing negative energies and clearing any energy vampires. I went to a workshop in January 2020 and was told to keep a piece of black obsidian or black tourmaline near the entrance of my front door due to the Saturn-Pluto conjunction which happens every 34 years because there would be a lot of the social and political turmoil in 2020. That turned out to be accurate and feel that has kept my energies of my home calm.