Ein klarer Lernplan hilft mir im Alltag.

Ein is the indefinite article and here it means a.

It is used because Lernplan is:

• singular
• masculine (der Lernplan)
• the subject of the sentence, so it is in the nominative case

So:

• ein Lernplan = a learning plan

If it were definite, you would say:

• Der klare Lernplan hilft mir im Alltag. = The clear learning plan helps me in everyday life.

Because klar is an adjective placed before a noun, and in German these adjectives usually take an ending.

Here we have:

• ein
  • masculine noun
• nominative singular

In that pattern, the adjective takes -er:

• ein klarer Lernplan

This happens because ein does not fully show the grammatical information by itself, so the adjective ending helps mark it.

Compare:

• der klare Lernplan
• ein klarer Lernplan

German often makes compound nouns, where English might use two words.

So:

• lernen = to learn
• Plan = plan
• Lernplan = learning plan / study plan

The last part, Plan, is the main noun, so it decides the gender:

• der Plan
• therefore der Lernplan

Also, all nouns in German are capitalized, so Lernplan and Alltag both start with capital letters.

Hilft is the 3rd person singular present tense of helfen.

The subject is Ein klarer Lernplan, which is singular, so the verb must also be singular:

• ich helfe
• du hilfst
• er/sie/es hilft

Notice that helfen is a stem-changing verb:

• e changes to i in du and er/sie/es
• so it becomes hilfst / hilft

Because helfen takes the dative case, not the accusative.

So:

• jemand hilft mir = someone helps me

Forms of ich:

• ich = nominative
• mich = accusative
• mir = dative

Since helfen requires dative, the correct form is:

• hilft mir

This is a very important pattern to remember:

• helfen + dative

Examples:

• Er hilft mir.
• Sie hilft dem Kind.
• Kannst du mir helfen?

Im is a contraction of:

• in dem → im

So:

• im Alltag = in everyday life / in day-to-day life

This expression is very common in German.

Alltag means:

• everyday life
• daily routine
• normal day-to-day situations

So im Alltag means something like:

• in ordinary daily life
• in practical daily situations

Because im already contains dem, and dem is dative singular.

• im = in dem

Also, in can take either:

• accusative for movement/direction
• dative for location/state

Here there is no movement. The idea is within everyday life, so German uses dative:

• im Alltag

Compare:

• Ich gehe in die Stadt. → movement, so accusative
• Ich bin in der Stadt. → location, so dative

The basic structure is:

• Ein klarer Lernplan = subject
• hilft = verb
• mir = indirect object in the dative
• im Alltag = prepositional phrase

So the sentence follows normal German main-clause word order, where the finite verb is in position 2:

• Ein klarer Lernplan | hilft | mir im Alltag.

This is very typical German word order.

You could also change the emphasis:

• Im Alltag hilft mir ein klarer Lernplan.

In that version, Im Alltag comes first, but the verb still stays in second position.

Yes. That would also be correct.

• im Alltag = in everyday life
• im täglichen Leben = in daily life

Both are natural, but im Alltag is especially common and compact.

Alltag often sounds a little more like:

• normal routine
• practical day-to-day life

You usually learn the noun together with its article:

• der Lernplan

Since the final part of the compound is Plan, and der Plan is masculine, the whole compound is also masculine:

• der Lernplan

This is a useful rule for German compounds:

• the last element determines the gender and plural pattern

The article changes, and the adjective ending may change too.

Examples:

• Der klare Lernplan hilft mir im Alltag.
  The clear learning plan helps me in everyday life.

• Ein klarer Lernplan hilft mir im Alltag.
  A clear learning plan helps me in everyday life.

• Klare Lernpläne helfen mir im Alltag.
  Clear learning plans help me in everyday life.

Notice:

• singular definite: der klare Lernplan
• singular indefinite: ein klarer Lernplan
• plural: klare Lernpläne

This is part of the German adjective-ending system.