And you can just get the miracle grow slow release fertilizer pellets to start with. You just sprinkle it on top of soil every 3 months. It’s great for beginners and my hibiscus like it. I do use a plumeria fertilizer for mine but the levels of nutrients aren’t that different.
Miracle-Gro Available 3001910 Shake 'N Feed All Purpose Continuous Release Plant, 4.5 lb https://www.amazon.com/dp/B01N4GLFK8/ref=cm_sw_r_cp_api_i_sKF4BbP0REY8F
Both plants can get burned from too much fertilizer so this is a good start although there are more specific ones you can move onto later if you want. Though it’s not vital.