What types of visualizations were there? Which ones did I do personally?

Visualizations come in various types: charts (line, bar, pie), diagrams (trees, Sankey), maps, heatmaps, dashboards, etc.

Personally, I have created:

• Line charts to display trends over time using D3.js and Chart.js libraries.
• Bar charts for comparing categories, such as sales by regions.
• Interactive dashboards with filters and dynamic data updates.

An example of a simple line chart on Chart.js:

const ctx = document.getElementById('myChart').getContext('2d');
const myChart = new Chart(ctx, {
    type: 'line',
    data: {
        labels: ['Jan', 'Feb', 'Mar', 'Apr'],
        datasets: [{
            label: 'Sales',
            data: [10, 20, 15, 30],
            borderColor: 'rgba(75, 192, 192, 1)',
            fill: false
        }]
    },
    options: {
        responsive: true
    }
});

This approach helps users quickly perceive and analyze data.