LWC - meuPrimeiroComponente

<!--Arquivo html-->
<template>
  <lightning-card  title="Input com evento" icon-name="custom:custom44">
    <div class="slds-var-m-around_medium">
      <p class="estilo">Olá, {greeting}!</p>
      <lightning-input type="text" value={greeting} onchange={changeHandler} label="Escreva algo"></lightning-input>
    </div>
  </lightning-card>
</template>

//Arquivo javascript
import { LightningElement } from 'lwc';

export default class PrimeiroComponente extends LightningElement {
  greeting = 'Mundo';

  changeHandler(event){
    this.greeting = event.target.value;
  }
}

<!--Arquivo XML-->
    <targets>
        <target>lightning__HomePage</target>
        <target>lightning__RecordPage</target>
        <target>lightning__AppPage</target>
    </targets>
    <targetConfigs>
        <targetConfig targets="lightning__RecordPage">
            <objects>
                <object>Account</object>
                <object>Contact</object>
                <object>Opportunity</object>
            </objects>
        </targetConfig>
    </targetConfigs>