Summarize:

Some people will tell you to wait 3 days before you text someone when you get their number. However, after that much time, they might think you're not interested. Instead of playing games, text the person as soon as you feel like it. That will show them that you're already thinking of them, and they may be attracted to your straightforward approach. However, do avoid texting anyone too late at night or too early in the morning. You might wake them up, which they probably won't appreciate. When you're talking to your crush, you want them to know how thoughtful and clever you are. Using a lot of abbreviations, acronyms, and internet slang might make you seem unoriginal, and they can make your texts hard to read. Try sticking to regular spelling and correct grammar, instead. Sprinkling a few acronyms into your texts is fine. For instance, "OMG I have to tell you something!" is fine, whereas, "OMG u rnt going 2 believe what I heard" probably isn't going to win your crush's heart. Read your texts before you send them to try to catch any typos, as well. When you're first texting someone you like, don't weigh them down with all the problems in your life. Instead, keep your texts positive, clever, or funny. That will show your crush that you're a positive person who's fun to be around. For instance, you might send your crush jokes, cute stories about your day, or funny memes you come across. Avoid too much sarcasm, since it might not come across the right way in a text. Over time, you can gradually open up to your crush, especially if you see them doing the same thing. When you like someone, it can be tempting to read into every text they send you, looking for any sign of how they feel. However, the best way to know for sure whether your crush likes you is just to spend time talking to them. It will become clear in time, so just relax and have fun, and let things develop naturally. For instance, just because your crush sends you short texts doesn't necessarily mean they're mad at you or that they don't like you. They may just be busy. If you're constantly sending long blocks of texts and your crush is only sending you back short texts (or not texting you back at all), they're probably busy, and they might get aggravated if you keep blowing up their phone. You don't have to send exactly 1 message for every 1 message they send, but do try to keep it to a close ratio. Don't text the person to ask them why they're not texting you. That can come across as desperate or pushy. If they're not answering, give them some space. If your crush is always the one who has to say goodbye first, they might start to feel like you like them more than they like you. Give them a chance to miss you by ending the conversation a little earlier than they expect. If you're ending the conversation because you have somewhere to go, make sure to mention that so they know you have a busy, well-rounded life! Leave your crush hanging by saying something like, "Oh, remind me tomorrow to tell you about my job interview!"
Don't feel like you need to wait a certain amount of time before you text. Avoid using a lot of slang in your texts. Keep your texts lighthearted, especially at first. Don't overthink it. Try not to text the other person way more than they text you. Try to be the first one to end the conversation.