Learn Hardcore Indonesian: Saya mendaftar ke kelas pelatihan secara daring. - I register for the training class online.

Breakdown of Saya mendaftar ke kelas pelatihan secara daring.

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Why is ke used after mendaftar? Could I use di or untuk instead?

mendaftar ke + event/institution: sign up to/for a program, class, etc. Example: Saya mendaftar ke kelas itu.
mendaftar untuk + purpose/target: sign up for (more explicit “for”). Example: Saya mendaftar untuk kelas itu. Both ke and untuk work here.
mendaftar di + physical place/platform: register at a location or on a site. Example: Saya mendaftar di situs universitas. Avoid mendaftar di kelas (a class is not the registration location).

Can I drop the preposition and say “mendaftar kelas pelatihan”?

No. mendaftar is intransitive and does not take a direct object. Use a preposition or switch to the transitive form:

What’s the difference between mendaftar and mendaftarkan?

mendaftar: intransitive; the subject signs up (themselves). Example: Saya mendaftar untuk kursus itu.
mendaftarkan: transitive with -kan; the subject registers something/someone. Often used with diri (oneself) or another object. Examples:
- Saya mendaftarkan diri ke kursus itu.
- Orang tua mendaftarkan anaknya ke kelas.

Can I say daftar instead of mendaftar?

Yes, in casual speech. Examples:

Casual: Aku daftar kelas pelatihan online.
Neutral/formal: Saya mendaftar ke kelas pelatihan secara daring. In writing or formal settings, prefer mendaftar.

Is secara daring the same as online? Which sounds more natural?

secara daring: standard/official-sounding (from “dalam jaringan”).
online: very common and natural in everyday speech.
You’ll hear all of these: Saya mendaftar secara daring / Saya mendaftar online / Saya daftar daring.

Do I need secara? Where else can I put the adverb?

You can drop secara and say daring or online: Saya mendaftar daring / Saya mendaftar online.
Other options: lewat daring, secara online, melalui situs web.
Placement:
- Saya mendaftar ke kelas pelatihan secara daring. (default)
- Saya mendaftar secara daring ke kelas pelatihan. (also fine)
- Secara daring, saya mendaftar ke kelas pelatihan. (fronted for emphasis)

Does the sentence show tense? How do I say past/present/future?

Indonesian doesn’t mark tense; use time markers:

What’s the nuance of kelas pelatihan vs pelatihan vs kursus?

pelatihan: a training program/event (often short, skills-focused).
kursus: a course (often structured, longer-term classes like language courses).
kelas: a class/session or the group itself.
kelas pelatihan: a training class (emphasizes a specific class within a training context). Examples:
Saya mendaftar ke pelatihan kepemimpinan. (a training event)
Saya mendaftar ke kursus bahasa Indonesia. (a course)
Saya mendaftar ke kelas pelatihan Photoshop. (a specific class)

Is Saya the best pronoun here? What about Aku?

Saya: neutral and polite; safe in most situations.
Aku: casual/intimate; use with friends/peers.
Very casual regional options exist (e.g., gue in Jakarta), but Saya is the safest default.

How do I make it clear I mean a specific class?

Use determiners:

That/the class: kelas pelatihan itu / kelas pelatihan tersebut (more formal/written).
A/one class (rarely needed): sebuah/satu kelas pelatihan (only if you must emphasize “one”).

Can I use kepada instead of ke?

Generally no for a class. Use kepada for people or person-like recipients:

Saya mendaftar kepada panitia/koordinator. (register with the committee/organizer)
Saya mendaftar ke kelas/pelatihan. (to a class/training)

How would I ask “Did you register for the training class online?”

Neutral/formal: Apakah kamu/Anda sudah mendaftar ke kelas pelatihan secara daring?
Conversational: Kamu sudah daftar kelas pelatihan online?