The main target of the game is to sell products and gain points for the products you sell.
Each product has a different selling price and will give a different amount of points.
The products are divided into tiers when tier 0 is the easiest to produce and the ones that provide the least money and points, and tier 4 is the most difficult to produce and will give the most money and points.

When you choose what to sell you need to create a plan and set the end goal.
What is the product you want to produce in your end game?
Some will choose cake because it gives lots of points while others may want to produce silica and sell in bigger bulk and faster.
Items prices and values by selling tiers:
ITEM - PRICE (for 1 item) - POINTS (for 1 item)
Tier 0:
- Crude Oil - 50$ - 1
- Water - 50$ - 1
- Water Drum - 50$ - 1
- Energy - 150$ - 1
- Wood - 250$ - 1
- Oak Wood - 250$ - 1
- Brine - 300$ - 1
- Cotton - 350$ - 1
- Wheat - 300$ - 1
- Sugarcane - 400$ - 1
- Feed - 450$ - 4
Tier 1:
- Silica - 1,200$ -> 1,000$ - 8 -> 2 (DOWN)
- Petroleum - 450$ - 4
- Gasoline - 1,450$ - 8
- Lumber - 1,350$ - 8
- Chardonnay Grapes - 1,250$ - 18 -> 8 (DOWN)
- Eggs - 1,650$ - 12
- Flour - 2,250$ - 12
- Cotton Yarn - 3,250$ - 16
- Sugar - 3,150$ - 16
- Cabernet Grapes - 2,800$ - 36 -> 16 (DOWN)
- Milk - 4,000$ - 20
- Wool - 4,550$ - 24
- Pinot Noir Grapes - 4,100$ -> 2,870$ - 45 -> 20 (DOWN)
- Jet Fuel - 1,900$ - 27
- Salt - 2,550$ -> 5,100$ - 16 -> 48 (UP)
Tier 2:
- Iron - 4,600$ - 54
- Chromium- 4,600$ - 54 -> 162 (UP)
- Limestone - 4,600$ - 54 -> 162 (UP)
- Bread - 15,550$ -> 18,100$ - 153 -> 171 (UP)
- Butter - 16,250$ -> 21,350$ - 153 -> 198 (UP)
- Wool Yarn - 24,250$ - 225
- Dough - 29,150$ -> 34,250$ - 270 -> 315 (UP)
Tier 3:
- Oak Barrel - 5,500$ - 63
- Wine Bottle - 12,800$ -> 12,200$ - 126 -> 117 (DOWN)
- Batter - 48,700$ -> 58,900 - 450 -> 540 (UP)
- Uniform - 34,450$ - 560
- Steel - 47,000$ - 768
- Baguette - 91,300$ -> 111,700$ - 1472 -> 1,808 (UP)
Tier 4:
- Chardonnay - 27,950$ -> 27,150$ - 464 -> 448 (DOWN)
- Cabernet Sauvignon - 42,000$ -> 41,200$ - 688 -> 672 (DOWN)
- Pinot Noir - 57,200$ -> 46,570$ - 928 -> 768 (DOWN)
- Pumpkin Pie - 49,750$ - 816
- Cake - 178,050$ -> 208,650$ - 4475 -> 5,250 (UP)
- Blue Steel - 270,950$ - 6,800
Production step by step view: (Thanks to https://townstarguide.com) + my additions

Good Luck :)