1- The most important thing for learning tekken, as well as any other game, is to find a character that speaks to you. Character design, gameplay mechanics, whatever it may be. Do you like sitting in training mode with that one track on loop, practicing the perfect answer? You might like a Mishima like Devil Jin or Kazuya. Do you like being a WWE superslam star? Pick King and dunk on em. Whoever you decide to learn, take a look at the move list (play clip). Don't worry about all this shit right now, take your time. This character is your new best friend, and you have a long time to get to know them.
https://www.twitch.tv/mikeross/clip/NurturingExcitedLemurSwiftRage?filter=clips&range=all&sort=time
2-  Make sure you're comfortable with whatever controller you choose to use. Pad, Stick, Keyboard, whatever it may be. Understand what your 1,2,3, and 4 buttons are.
3- After you've messed around with your buttons and understand what button does what limb, its time to figure out our movement. Try dashing forward by tapping your movement key twice rapidly (show myself dashing forward). Now that we've gotten that done a few times, try dashing backwards the same way.
4- We'll discuss frame data and punishes later, but for now understand that your 1 jab is your best move. We're not talking about flashy combos, ss punishes or anything fancy yet, but remember that your 1 jab is singlehandidly your best move. If you don't know shit about a matchup, which you won't, just hit em with a 1 for a punish
5- When we talk defense, there's a few things to keep in mind at first. Most important thing is to always try and block mid *first*. You don't want to be blocking low randomly and eat a full launcher. Block mid, wait, react to lows the best you can. If you're hit, just try to block when you're free especially at the beginner level.
6- Throws. You've heard or seen throws before, and they look super complicated but fuck that. We'll talk about regular throws first, just to keep it plain. Your regular throws are either 1+3, or 2+4. If you're caught in a regular throw, be it a 1 throw or a 2 throw, try to unthrow yourself (called a "throw tech") by pressing one of your punch buttons. Don't hit BOTH, or the game straight up denies you and you're going to eat that entire throw. You want to tech the enemies throw so you dont end up eating a ton of fuckin damage for free. I'll make another video completely dedicated to throws, but for now keep this in mind. Tech your fucking throws online against that 2 bar Law player
7- the final point i want to bring up is to find the shit you enjoy about Tekken. I myself come from 2D fighters, and i absolutely love the characters in Tekken. You may love the movement options, the sick ass combos, whatever it is. I encourage you to find the things you like and embrace them, and once you're comfortable to maybe find a community that you can be a part of. Fighting games are fine by themselves, but playing long sets with some friends or going to a local is always going to raise your enjoyment a thousand percent.