Start with knife skills -- that is one of the most important parts of cooking. Practice cutting onions. dicing carrots, and basic butcher cuts. You're also going to want a high quality chef's knife as this is the cornerstone of cooking. It's better to invest in a good knife early on and learn how to take care of it and its edge than buying shitty walmart/supermarket knives. Remember - a dull knife is a dangerous thing in the kitchen.
Learn seasoning - you can have exactly the same ingredients create entirely different dishes with small tweaks to seasoning. No, hot sauce and all that retarded sucker punch flavouring methods is not 'seasoning' in a good way.
Learn how your oven and stove integrate with your pots and pans, their heat transfer efficiency; how quickly it goes from 0 to smoking. That will help when you actually cook because not all cookware is created equally.
Learn the different uses of oils and fats; their smoking points; etc.
Get a food thermometer; most cooks don't use them at home, but for someone with no experience it can both stop you from getting super fucking sick but also give you a thermal guideline on what a dish's peak core temp is.
Figure out your preferred cuisine and style -- this is going to heavily impact what you should prioritise learning. Western dishes tend to be cooked a lot slower than something like Chinese dishes.
Here are some basic practice foods and dishes; I'll let you find your own recipes:
Eggs - I know that sounds retarded, but eggs are actually difficult for most people to get right. The difference in how eggs are prepared is good for practicing cooking as it takes multiple forms, and is also super unforgiving so its pretty easy to figure out what went wrong if it goes tits up and correct it.
Mince (brown minced beef and stock with vegetables) forms the basis for a lot of dishes and can be turned in to Chilli, tacos, Beef bolognaise, sloppy joe etc. Here at least it's used as the foundation dish for most children to learn how to cook as it incorporates browning, the use of fats and flour, vegetables (and by proxy knife skills), reduction, simmer and boil control, seasoning, and how to use stock in dishes.
Chicken - practice cooking chicken, all cuts. Each cut of chicken has different meat and muscle types and as chicken is a fairly unassuming flavour it also serves as a good canvas for seasoning.
Potatoes - potatoes form the primary carb of western cuisine and just like eggs it can be used in various forms and techniques. Mash potato is somehow difficult to get right for people who don't come from a country in which its a primary side dish.
Soups - soups are a lot more forgiving than most other dishes, and often a lot cheaper to cook meaning you can practice a fair bit.
Cooking isn't hard, it's simply repetition and even more repetition. Knife skills are normally the hardest part for people following by temp control.
Unlike others I truly wouldn't recommend watching celebrity chef videos. You're a new born being expected to keep up with the final boss, when the final boss is designed to be for those with the skills in place already. Basically, celebrity chefs have an assumption that the person watching their videos has some kind of knowledge and practice.
Find a channel that specifically caters (pardon the pun) to newbies. There are also loads of places that do actual cooking lesson.
The best place I honestly think you should try is your family if you're close to them and on good terms. If your parents or grandparents cook literally just ask them to help you learn. Passing down cooking knowledge is literally one of the most primitive human constructs as far as passing knowledge from one generation to the other goes, and chances are your family members would appreciate being able to show you.
