In this hobby you are trying to balance 3 factors that will make a successful planted tank.
2. Nutrients(aka fertilizer)
The stronger(more par) the light, the more nutrients and CO2 you will need
Nutrients fall under 2 categories: Macro and Micro nuntrients.
Macro nutrients consists of nitrogen(N), phosphate(P), and potassium(K).
You can get these nutrients in products that's been prediluted in water or you can buy dry in chemical salt forms. Nitrogen - KNO3(Potassium nitrate), Phosphate - KH2PO4(Mono potassium phosphate), Potassium - K2SO4(Potassium sulfate)
You will often see fertilizers with numbers like 0-0-0, which stands for percentage of each nutrient in the product.
Micro nutrients are usually put together as 1 product because this is made up of small amounts(micro) of various nutrients. This can also be found in prediluted with water products or dry form often called Plantex CSM+B.
Plants need CO2 because they need the carbon in CO2 since all life on Earth is carbon based(we get our carbon from the food we eat). The CO2 with sufficient light will increase the growth rate of the plants. This can be provided in gas form diffused into the water by DIY CO2 with yeast and sugar or from pressurized CO2 tanks. Another form of carbon you can find is in Seachem Excel. It is an organic form of carbon in the active ingredient glutaraldehyde.
The key is to balance all 3 of those factors. If you want fast growing, constant maintenance, you need strong lights and more CO2 and more nutrients.
You should look into each factor more carefully and get an understanding on each one and how to adjust them if you want to avoid problems. If not you can learn by trial and error and adjust accordingly.