Have you created your own Helm Chart from scratch?

Yes, creating your own Helm Chart from scratch involves the following steps:

1. Create a directory and file structure, for example:

mychart/
  Chart.yaml
  values.yaml
  templates/
    deployment.yaml
    service.yaml

2. In Chart.yaml, describe the chart's metadata (name, version, description).
3. In values.yaml, set default parameters that can be overridden.
4. In the templates (templates/), describe Kubernetes manifests using Helm templating (Go templates) to substitute values from values.yaml.

Example of a simple Deployment template:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: {{ .Release.Name }}-app
spec:
  replicas: {{ .Values.replicaCount }}
  selector:
    matchLabels:
      app: {{ .Release.Name }}-app
  template:
    metadata:
      labels:
        app: {{ .Release.Name }}-app
    spec:
      containers:
      - name: app
        image: {{ .Values.image.repository }}:{{ .Values.image.tag }}
        ports:
        - containerPort: 80

Thus, creating a Helm Chart from scratch allows automating application deployment in Kubernetes with configurable parameters.