Buona sera Pilar, molto interessante, siete un network? Attendo sue. Tiziana Dal Pin
Both Photoshop and Illustrator
Photoshop
Photopea
yes , you can look at canva and figma
Figma
If you want just geometrical shapes use online draw.io
yes you do need them alot
You could use one of the standard free themes, or buy one. No need for a web designer.