selbstgemacht
homemade
Made by a person themselves and not bought or professionally produced. Often refers to food, clothing, or gifts.
Zum Nachtisch gibt es selbstgemachten Apfelkuchen.
For dessert, there is homemade apple cake.

homemade / self-inflicted
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homemade
Made by a person themselves and not bought or professionally produced. Often refers to food, clothing, or gifts.
Zum Nachtisch gibt es selbstgemachten Apfelkuchen.
For dessert, there is homemade apple cake.

The word is a clear compound of 'selbst' (self) and 'gemacht' (made), the past participle of 'machen' (to make). So it literally means something that you made yourself.
Diese selbstgemachte Limonade schmeckt fantastisch.
This homemade lemonade tastes fantastic.
The meaning depends heavily on the context. If the word refers to concrete things like food or gifts, it has a positive meaning. If it refers to abstract things like problems or stress, it means 'selbst verschuldet' (self-inflicted) and is negative.
Ich bringe einen selbstgemachten Salat zur Party mit.
I'm bringing a homemade salad to the party.
In the positive meaning, 'selbstgemacht' (homemade) is very often combined with food, drinks, gifts, or handicrafts. Typical examples are: selbstgemachte Marmelade (homemade jam), selbstgemachte Pasta (homemade pasta), ein selbstgemachtes Geschenk (a homemade gift).
Ich liebe die selbstgemachte Marmelade von meiner Oma.
I love my grandma's homemade jam.
In the negative meaning, 'selbstgemacht' (self-inflicted) almost always refers to abstract problems. Typical combinations are: ein selbstgemachtes Problem (a self-inflicted problem), selbstgemachter Stress (self-inflicted stress), or selbstgemachtes Leid (self-inflicted suffering).
Der ganze Stress bei der Arbeit ist selbstgemacht.
All the stress at work is self-inflicted.
industrial
'industriell' and 'selbstgemacht' are often opposites when it comes to how things are made. 'industriell' means that something is produced in a factory or with machines in large quantities. 'selbstgemacht' means that a person made something themselves, for example at home or for friends. With food, clothing, or gifts, the contrast is especially clear: 'industriell' suggests large-scale production, while 'selbstgemacht' suggests personal work.

Bring bitte den selbstgemachten Kuchen mit, den du gestern gebacken hast.
Please bring the homemade cake that you baked yesterday.
Viele Bäckereien verwenden heute industriell hergestellte Teiglinge.
Many bakeries today use industrially produced dough pieces.