What test kits should I buy for my aquarium or planted tank?

What test kits do you recommend? : r/PlantedTank

7 in 1 Aquarium Test Strips, 100 Strips Fish Tank Water Quality Test Freshwater Saltwater Test Kit for Test pH, Carbonate, Alkalinity, Hardness, Chlorine, Nitrite, Nitrate Aquarium Water Testing : Pet Supplies

【7-in-1 Aquarium Water Test Kit】Our fish tank strips can test the 7 most important parameters including Nitrate (NO3), Nitrite (NO2), Chlorine (CL2),

100PCS Aquarium Test Strips, 7 in 1 Aquarium Water Test Kit for Freshwater Saltwater Aquarium, Fish Tank Water Testing Kit for Test pH, Carbonate

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7 in 1 Aquarium Test Strips. Fish Water Test Strip. Freshwater Testing Kit for Betta and Marine Aquaponics. Tank PH Test Kit with Nitrate, Total

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Fluval Flora Planted Tank Kit 14.5 Gallon – Whitlyn Aquatics