Alternate Engineering Guide 1-300
I have not tried this guide yet, so please give feedback if this is better than the other one I posted.
Engineering is not just a profession; it’s a way of life in WoW Classic. From raid-winning explosives to game-changing PvP trinkets, no other craft offers the sheer power and utility of Engineering. This blueprint will guide you through the quickest and most cost-effective path to max skill.

Why Engineering? (The Endgame Goal)
Before you start, understand what max skill unlocks:
PvE DPS: The Goblin Sapper Charge (Goblin Specialization) is mandatory for optimal AoE damage in dungeons and speed running. The Gnomish Battle Chicken (Gnomish Specialization) provides a valuable Melee Haste buff.
PvP Mastery: Items like Iron Grenade (AoE Stun), Gnomish Net-o-Matic Projector (Root), and Reflectors (e.g., Gyrofreeze Ice Reflector) give you a significant, game-breaking advantage in duels and World PvP.
Utility: Field Repair Bot 74A (mobile repairs), Seaforium Charges (opening locked chests/doors), and Jumper Cables (combat resurrection attempt).

The Comprehensive Shopping List
Always remember to save components. The entire leveling path is designed to use low-level creations to fuel high-level ones.
https://ibb.co/Ld6hVsHJ

Leveling Path: Step-by-Step Instructions
1. Apprentice (1 – 75): Copper & Components
1 – 50: Your first 50 points come from crafting base components that must be saved:
Craft Rough Blasting Powder (60x)
Craft Handful of Copper Bolts (30x)
50 – 51: Craft Arclight Spanner (1x). KEEP THIS TOOL! You need it to craft many items.
51 – 75: Craft Rough Copper Bomb (~30x). This uses your saved powder and bolts.
2. Journeyman (75 – 150): Bronze & Frameworks
T:LearnJourneymanEngineeringatskill50,requiresLevel10+
75 – 100: Craft Coarse Blasting Powder (60x) and use them to make Coarse Dynamite (~20x).
100 – 125: Craft Silver Contact (5x) and Bronze Tube (25x). SAVE THE TUBES!
125 – 135: Craft Standard Scope (10x).
135 – 175: This is a component-heavy step:
Craft Heavy Blasting Powder (30x), Whirring Bronze Gizmo (15x), and Bronze Framework (15x). SAVE THEM ALL.
Use all the saved components to craft Explosive Sheep (15x).
3. Expert Engineer (150 – 225): Tools & Mithril
T:LearnExpertEngineeringatskill125,requiresLevel20+
175 – 176: Craft Gyromatic Micro-Adjustor (1x). KEEP THIS SECOND TOOL!
176 – 200: Craft Solid Blasting Powder (60x). SAVE! Finish with a few Mithril Tube (~7x).
200 – 250: The Mithril section. Again, craft components first:
Craft Unstable Trigger (20x) and Mithril Casing (40x). SAVE BOTH.
Use these saved components, plus Solid Blasting Powder, to craft Hi-Explosive Bomb (20x).
4. Artisan Engineer (225 – 300): The Final Push
T:Travelto∗∗BuzzekBracketswing∗∗in∗∗Gadgetzan,Tanaris∗∗(Horde/Alliance)tolearnArtisanEngineering.RequiresLevel35+
250 – 260: Craft Dense Blasting Powder (30x). SAVE!
260 – 285: Thorium Widget (~35x) is your best skill-up. The Schematic is sold by vendors in Orgrimmar/Ironforge.
285 – 300: Finish with Thorium Shells (15x) or Thorium Tube. The Thorium Shells schematic is a BoE World Drop and can be expensive. Check the AH or opt for the easier Thorium Tube.

The Critical Choice: Specialization at 200 (Level 30)
Once you hit Skill 200 and Level 30, you face the most important decision: Goblin or Gnomish Engineering. This choice is permanent without the expensive and time-consuming process of unlearning and re-leveling.
Gnomish Engineering (Utility and Control)
Focus: Clever gadgets, utility, control tools, and unpredictable, fun effects.
Key BoP Item: The Gnomish Battle Chicken. This is critical as it provides a party-wide Melee Haste buff, making Gnomish desirable for many Melee DPS in competitive PvE.
Teleporter: Ultrasafe Transporter: Gadgetzan (Tanaris). Useful for quick access to the neutral city hub.
Ideal For: Melee DPS (due to the Chicken), players who prioritize utility over pure damage, and General PvP.
Goblin Engineering (Destruction and Explosives)
Focus: Pure destructive power, high damage, and high-risk maneuvers.
Key Consumable: Goblin Sapper Charge. This is the most crucial item, providing massive AoE damage essential for tank threat and dungeon/raid speed runs.
Key BoP Item: Goblin Jumper Cables XL (offers a higher chance of combat resurrection success compared to the regular version).
Teleporter: Dimensional Ripper - Everlook (Winterspring). Closer to the Songflower buff area, which can be useful.
if you want more detail check goblin vs gnomish engineering guide
Understood. Here are the two new sections (Gold Making and Pairing) translated and formatted for your English forum post, ready to be inserted before the final conclusion.

Gold Making: Is Engineering Profitable?
Engineering is traditionally a profession for personal use and optimization, not for direct income generation. Unlike Tailoring (Bags) or Alchemy (Potions), most Engineering items are crafted for the Engineer's own benefit.
However, there are key opportunities for making gold:
Explosives Bulk Sales:
If you are a Goblin Engineer, crafting Goblin Sapper Charges and Dense Dynamite in bulk and selling them to raiding guilds can generate decent profit. This is especially true during phases that demand high AoE damage.
Ammunition & Scopes (Hunter Market):
Crafting Thorium Shells/Arrows and high-end scopes like the Biznicks 247x128 Accurascope provides a steady, reliable income stream. These are consumables that Hunters constantly need.
Utility Gadgets:
Bound on Equip (BoE) items like the Gnomish Alarm-o-Bot (to detect rogues/druids) or early-game helms can be sold on the Auction House, though the profit margin is often small.
Gold Making Summary: The true financial benefit of Engineering is in the cost savings. By crafting all your own essential tools (bombs, transporters, scopes), you will save thousands of gold that you would otherwise spend on the Auction House.

Best Profession Pairing: What Should I Take With Engineering?
The choice for the best secondary profession to pair with Engineering is overwhelmingly clear:
Mining: The Essential Pairing
The Reason: Engineering is entirely dependent on Ore and Stone for every skill point from 1 to 300.
You need Mining to gather the raw materials for Copper, Bronze, Mithril, and Thorium Bars.
All the necessary Blasting Powders (Rough, Coarse, Heavy, Solid, Dense), which make up the vast majority of your skill-ups, are crafted directly from the Stone you gather while Mining.
Cost Efficiency: Without Mining, you will be forced to buy every single piece of ore and stone from the Auction House, which will quadruple the cost of leveling Engineering.
Can I pair it with anything else?
Yes, if your goal is purely financial, you could pair Engineering with another gathering profession like Herbalism or Skinning and sell those raw materials to fund your Engineering level. However, this is significantly less time-efficient than just gathering your own Engineering materials via Mining.