kyuukyuuhou wo narau.

It is read:

きゅうきゅうほう を ならう

• 救急法（きゅうきゅうほう） = first aid / emergency treatment methods
• 習う（ならう） = to learn, especially by being taught

So the whole sentence is きゅうきゅうほうをならう.

救急法 means first aid or emergency care methods.

Breaking it down:

• 救急（きゅうきゅう） = emergency, first aid, urgent care
• 法（ほう） = method, way, technique

So 救急法 is literally something like emergency-treatment methods.

In natural English, it is usually just first aid.

を marks the direct object of the verb.

In 救急法を習う, the thing being learned is 救急法, so it takes を:

• 救急法 = first aid
• を = marks what is being learned
• 習う = learn

So this is literally learn first aid.

This is a very common learner question, because all of these can relate to learning.

習う（ならう） often means:

• to learn from someone
• to take lessons in something
• to be taught something

So 救急法を習う suggests learning first aid in a class, course, or from an instructor.

Compare:

• 救急法を習う = learn first aid by being taught
• 救急法を学ぶ = study/learn first aid in a somewhat broader or more formal sense
• 救急法を勉強する = study first aid

For a course or practical training, 習う sounds very natural.

Often, yes, or at least some kind of instruction.

習う tends to suggest:

• a teacher
• a class
• lessons
• training from someone more experienced

For example:

• 先生に日本語を習う = learn Japanese from a teacher
• 母に料理を習う = learn cooking from one’s mother

In 救急法を習う, the person teaching is not stated, but it is easy to imagine a class, trainer, or organization.

習う is in the plain non-past form.

In Japanese, the non-past can mean:

• present/habitual: learn / study
• future: will learn

So depending on context, 救急法を習う。 could mean:

• I learn first aid.
• I will learn first aid.
• To learn first aid. (in certain list/title contexts)

Japanese tense is often understood from context rather than the verb form alone.

The subject is omitted, which is very normal in Japanese.

Japanese often leaves out words like:

• I
• you
• he/she
• we

if the context already makes them clear.

So 救急法を習う。 could mean:

• I learn first aid.
• We will learn first aid.
• He is learning first aid.

The exact subject depends on the situation.

Yes, it can be a complete sentence.

Japanese often allows short sentences with:

• no explicit subject
• no explicit topic
• just an object + verb

That is perfectly natural when the context is understood.

This kind of sentence is especially common in:

• textbook examples
• schedules
• lesson plans
• simple statements

The spaces are usually just for learners.

Normally, Japanese is written without spaces, so this would usually appear as:

救急法を習う。

Textbooks and beginner materials often insert spaces to make the structure easier to see:

• 救急法
• を
• 習う

But in normal Japanese writing, you generally would not add those spaces.

Yes, and that would also be natural.

There is a slight nuance difference:

• 救急法 = first aid methods; a bit more formal or systematic
• 応急手当（おうきゅうてあて） = first aid / emergency treatment given immediately

So:

• 救急法を習う can sound like learning the techniques or the subject of first aid
• 応急手当を習う can sound like learning how to give immediate first aid treatment

Both are possible, but 救急法 fits very well in course or training contexts.

The 。 is the Japanese period, marking the end of the sentence.

So:

• 救急法を習う = the sentence itself
• 救急法を習う。 = the sentence with proper punctuation

It works like a full stop in English.