Saya gemar makan roti hangat setiap pagi.

Gemar is a verb meaning “to be fond of” or “to really like” something in a habitual sense. You can indeed replace it with suka (“to like”) without losing the basic meaning:

• Saya gemar makan roti hangat setiap pagi
• Saya suka makan roti hangat setiap pagi
  Using suka is more common in everyday speech, while gemar feels slightly more formal or emphasizes that it’s a regular habit or hobby.

Indonesian does not use definite or indefinite articles. Roti by itself can mean “bread,” “a piece of bread,” or “the bread” based on context. To specify quantity or definiteness, you add words such as:

• sepotong roti (“a slice of bread”)
• roti itu (“that bread”)

Yes. Indonesian is a pro-drop language, so you can drop pronouns when the subject is clear.

• Gemar makan roti hangat setiap pagi
  still clearly means “I like eating warm bread every morning,” especially in informal contexts.

Setiap pagi means “every morning” and indicates frequency. You can use other time expressions like:

• pagi-pagi (“early in the morning”)
• setiap hari (“every day”)
  You can also place setiap pagi at the beginning or end of the sentence:
• Setiap pagi saya gemar makan roti hangat
• Saya gemar makan roti hangat setiap pagi
  Both are grammatically correct; putting it at the end is most common.

Memakan is the transitive verb form with the me- prefix, emphasizing the action upon the object. It’s correct but more formal or literary:

• Saya gemar memakan roti hangat setiap pagi
  In everyday conversation, the simple makan is preferred.

Indonesian nouns generally do not change form to mark plurality. Roti can be singular or plural based on context. To specify multiple pieces you can use:

• Quantifiers: beberapa roti (“some breads”)
• Reduplication (colloquial): roti-roti
  In the example sentence, roti implies “bread” in general or multiple servings as part of the routine.