Shopify advanced setup help

I am looking for a Shopify expert to help me with the advanced setup of my Shopify store.

Specific areas of assistance include theme customization.

I do not require any extra features or plugins, just basic setup.

I already have an existing Shopify account.

Ideal skills and experience for this job include:
- Proficiency in Shopify platform
- Knowledge of theme customization
- Experience with payment gateway integration
- Strong attention to detail and problem-solving abilities.
Basically I am looking for hands on online training so I can learn as we go.
Want to setup different themes per product categories.