In response to a friend that wanted to grow again and had not done so in 20 years. I replied : It is a wonderful and rewarding hobby. There are key principals that still are the same from 20 years ago. One is the book I am linking below. It has been updated every X years since ... 1. Lights : You will get lots of attention on light brand. I would suggest going with a big brand name and verify support and return policy directly with MFG. The big names like HLG, Spider Farmer, Mars .... They may not be the best lights at any given moment however they may have the best support and return policies.

2. Nutrients : General Hydroponics flora 3 part nutrients for similar reasons. ( Because they have been there ). Starting back in you want to eliminate *cough choke* reduce as many variables as you can.

3. Soil : There are as many soils as nutrients. A fairly priced mix of "Ocean Forest and Ocean Frog" is an easy option for done in one... However beware the heat of the Ocean Forest by itself and there have been bug reports on some of their soil. The modern cloth grow bags between 5 and 7 gallons will do you. Almost impossible to overwater when you use cloth pots and good for oxygen.

4. Air : Keep it moving. The "canopy" should like like a dance contest as the plants are exercised and encouraged to grow strong nutrient streams and thicker stalks.

5. Water : PH, PPM... EC easy terms really. However I have not had much need other than to check my PH at my source. The rest for future grows or hydroponic techniques.

Obviously tap water is a no. ( in most places ) You want a water that is just below 7.0 neutral. Many will go plus or minus but most avoid 8. The goal here is to keep our plants receptive to uptalking the nutrients and preventing lock out.

6. Remedies : Over water or other root damage can be assisted with a tablespoon of Hydrogen Peroxide to 5 gallons of water. The extra "Oxygen" molecule will help mend and heal root damage. Banana extraction tea and molasses during flower or as needed when the plant indicates need.

7. Enjoy and try to KISS the first few grows. The Book

https://www.amazon.com/gp/product/B004WKUY2S