Aquesta rutina és fàcil.

Because rutina is a feminine singular noun, and Catalan demonstratives have to agree with the noun they go with.

• aquest = masculine singular
• aquesta = feminine singular
• aquests = masculine plural
• aquestes = feminine plural

So:

• aquest llibre = this book
• aquesta rutina = this routine

In Catalan, many nouns ending in -a are feminine, and rutina is one of them. That is why it takes feminine words around it, like aquesta.

You can see the agreement clearly:

• aquesta rutina
• not aquest rutina

As with all nouns, it is best to learn the gender together with the word.

Usually, yes: aquesta is the feminine singular form meaning this.

Very roughly:

• aquesta = this
• aquella = that

In real usage, especially in modern spoken Catalan, the exact this/that distinction can be a little flexible depending on dialect and context, but for a learner, treating aquesta as this is the right starting point.

Because aquesta already functions like this in English. Catalan normally does not use an article before a demonstrative.

So:

• aquesta rutina = this routine
• not la aquesta rutina

This works just like English: we say this routine, not the this routine.

És is the third-person singular present form of ser, which means to be.

So here it means:

• és = is

Examples:

• La rutina és fàcil. = The routine is easy.
• Això és important. = This is important.

In your sentence, aquesta rutina is the subject, and és fàcil means is easy.

The accent in és helps distinguish it from es, which is a different word.

• és = is
• es = a pronoun, often reflexive, like oneself / himself / herself / itself depending on context

The accent also shows that és is stressed.

So the accent is important: és and es are not the same word.

The accent shows where the stress goes: FÀ-cil.

Without the accent, a learner might expect a different stress pattern. Catalan spelling uses accents partly to show when a word is stressed in a way that is not the default.

So:

• fàcil is stressed on the first syllable
• not fa-CIL

The accent is also part of the normal spelling, so it should be written.

Not in the singular. Fàcil has the same form with masculine and feminine singular nouns.

• un exercici fàcil = an easy exercise
• una rutina fàcil = an easy routine

In the plural, it becomes:

• fàcils

Examples:

• exercicis fàcils
• rutines fàcils

Because fàcil is functioning as a predicate adjective after the verb ser.

The structure is:

• subject + ser + adjective

So:

• Aquesta rutina
  • és
    • fàcil

This is similar to English:

• This routine
  • is
    • easy

It is not about adjective position inside a noun phrase; it is simply the normal pattern after to be.

Normally, no. In standard Catalan, és fàcil is the natural and correct choice.

Catalan usually uses ser for qualities like:

• fàcil = easy
• difícil = difficult
• important = important

So you say:

• Aquesta rutina és fàcil.

Using estar here would sound unnatural to most speakers.

A careful approximate pronunciation is:

uh-KES-tuh roo-TEE-nuh es FA-sil

A few notes:

• aquesta: stress on KES
• rutina: stress on TI
• és: a clear stressed es
• fàcil: stress on FA

A more IPA-style version, in one common pronunciation, is roughly:

/əˈkɛs.tə ruˈti.nə es ˈfa.sil/

Exact vowel sounds vary by dialect, but the stress pattern stays very useful for learners.

Sometimes Catalan can omit subject pronouns like jo, tu, ell, because the verb ending often shows who the subject is. But here the subject is not a pronoun; it is the full noun phrase aquesta rutina.

So in this sentence, the subject is normally expressed:

• Aquesta rutina és fàcil.

You would not normally just say És fàcil unless the context already makes it completely clear what it is.