You have to set definitions property:

<!-- HTML -->
<q-editor v-model="post.body" :definitions="definitions"/>

// script

data() {
    return {
        definitions: {
                insert_img: {
                    tip: 'Insertar Imagen',
                    icon: 'photo',
                    handler: this.insertImg // handler will call insertImg() method
                }
            }
        }
    },
    methods: {
        insertImg() { // insertImg method
            const post = this.post
            // create an input file element to open file dialog
            const input = document.createElement('input')
            input.type = 'file'
            input.accept = '.png, .jpg' // file extensions allowed
            let file
            input.onchange = _ => {
                const files = Array.from(input.files)
                file = files[0]
  
               // lets load the file as dataUrl
                const reader = new FileReader()
                let dataUrl = ''
                reader.onloadend = function() {
                    dataUrl = reader.result
                   
                    // append result to the body of your post
                    post.body += '<div><img src="' + dataUrl + '" /></div>' 
                }
                reader.readAsDataURL(file)
            }
            input.click()
        }
}

You can declare your <q-table> in a “more explicit” way by specifying the slot templates and omitting the select component of header or just set the hide-header property in case it isn’t indispensable.

<q-table
        title="Example"
        :data="data"
        :columns="columns"
        row-key="name"
        selection="multiple"
        :selected.sync="selected"
      >
  
        <template v-slot:header>
           <!-- your custom header here -->
        </template>
  
</q-table>

The best way I found is setting height with on component created with JavaScript. I’t worked for me.

<template>
    <q-carousel class="text-white" :height="windowHeight" arrows color="white" infinite autoplay>
        <q-carousel-slide :img-src="slide.imagen" v-for="(slide, index) in slides" :key="index">
            <div class="carousel-caption">
                <div class="carousel-title">
                    {{ slide.titulo }}
                </div>
                <div class="carousel-subtitle" v-html="slide.texto" />
            </div>
        </q-carousel-slide>
    </q-carousel>
</template>

<script>
export default {
    created() {
        this.windowHeight = window.innerHeight + 'px'
    }
}
</script>

@justdior let’s do it! Tell me more about it. What kind of error have you got?