schmieden
to forge
To shape metal, especially iron, while it is heated by hammering and working it into a desired form.
Der Hufschmied schmiedet ein glühendes Eisen auf dem Amboss.
The farrier forges a glowing piece of iron on the anvil.

to forge
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to forge
To shape metal, especially iron, while it is heated by hammering and working it into a desired form.
Der Hufschmied schmiedet ein glühendes Eisen auf dem Amboss.
The farrier forges a glowing piece of iron on the anvil.

The verb 'schmieden' (to forge) has a literal and a figurative meaning. The literal meaning always refers to working metal. The figurative meaning is used for developing abstract things such as plans or relationships.
Der Schmied schmiedet ein Hufeisen.
The blacksmith forges a horseshoe.
There is a well-known proverb: 'Man muss das Eisen schmieden, solange es heiß ist.' (You have to strike while the iron is hot.) It means that you should take advantage of a good opportunity immediately.
Das Jobangebot ist gut, also nimm es an! Du musst das Eisen schmieden, solange es heiß ist.
The job offer is good, so accept it! You have to strike while the iron is hot.
In this figurative meaning, 'schmieden' (to hatch/forge) is often combined with abstract nouns that express planning or conspiracy. Typical phrases are 'Pläne schmieden' (to make plans), 'Intrigen schmieden' (to hatch intrigues), or 'ein Komplott schmieden' (to hatch a plot).
Im Urlaub haben wir schon Pläne für die nächste Reise geschmiedet.
On vacation, we were already making plans for the next trip.
When it comes to relationships, 'schmieden' (to forge) is used to describe the active and often effortful creation of a strong connection. Common combinations are 'eine Freundschaft schmieden' (to forge a friendship), 'ein Bündnis schmieden' (to forge an alliance), or 'eine Allianz schmieden' (to forge an alliance).
Durch die gemeinsame Arbeit haben sie eine enge Freundschaft geschmiedet.
Through working together, they forged a close friendship.
to plan
'planen' and 'schmieden' can both mean that you think up something for the future. 'planen' is neutral and works for almost all normal plans, such as appointments, trips, or projects. In this meaning, 'schmieden' is used figuratively, often in fixed combinations like 'Pläne schmieden' (to hatch/make plans) or 'ein Bündnis schmieden' (to forge an alliance). It sounds stronger, livelier, and sometimes also secretive or strategic. In everyday life, people usually say 'planen'; 'schmieden' fits when the idea is meant to seem especially big, important, or somewhat dramatic.

Nach dem Gespräch schmiedet Noah neue Pläne für sein Kulturprojekt.
After the conversation, Noah makes new plans for his cultural project.
Heute planen die Trainer das nächste Spiel der Mannschaft.
Today the coaches are planning the team's next game.