lecker
delicious
Describes foods or drinks that taste very good. It is a commonly used, somewhat colloquial word.
Mmh, der Kuchen ist wirklich sehr lecker!
Mmm, the cake is really very delicious!

delicious
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delicious
Describes foods or drinks that taste very good. It is a commonly used, somewhat colloquial word.
Mmh, der Kuchen ist wirklich sehr lecker!
Mmm, the cake is really very delicious!

'Lecker' (delicious) is a very common word in everyday speech. In very formal contexts, such as the menu of a gourmet restaurant, it is often avoided.
Die Suppe, die du gekocht hast, war super lecker!
The soup you cooked was super delicious!
The word 'lecker' (delicious) is used almost exclusively for food and drink. You cannot use it to describe, for example, a book, a film, or the weather.
Wir haben gestern einen sehr leckeren Wein getrunken.
Yesterday we drank a very delicious wine.
The adjective 'lecker' (delicious) is extremely widespread throughout Germany. In Austria and Switzerland it is used much less often.
In diesem Café gibt es wirklich leckeren Apfelstrudel.
This café has really delicious apple strudel.
good
'gut' and 'lecker' can both be positive when talking about food or drinks. 'gut' is more general: a meal can be good because it tastes good, is healthy, was well cooked, or is of good quality. 'lecker' almost always refers to taste and sounds more everyday and colloquial. The words are easy to confuse because you can say both after eating. If you only want to say that something tastes good, 'lecker' is more natural. If you are talking more generally about quality, 'gut' fits better.

Ich habe gestern eine leckere Suppe mit frischem Gemüse gekocht.
Yesterday I cooked a delicious soup with fresh vegetables.
Das Essen im Krankenhaus ist heute wirklich gut.
The food at the hospital is really good today.