Ich mache die Überweisung online, weil das im Alltag schneller ist.

Because weil is a subordinating conjunction. In German, subordinating conjunctions introduce a clause where the finite verb goes to the end. A comma must separate the main clause from that subordinate clause.

• Main clause: Ich mache die Überweisung online,
• Subordinate clause: weil das im Alltag schneller ist.

Yes. Denn also means “because,” but it’s a coordinating conjunction, so word order stays normal (verb in second position):

• Ich mache die Überweisung online, denn das ist im Alltag schneller. Nuance: weil is neutral and very common in speech; denn is more written/formal or adds a slightly explanatory tone.

No.

• das (one s) = the article/pronoun “the/that.” Here it’s a pronoun: weil das …
• dass (double s) = the conjunction “that” introducing a content clause: Ich weiß, dass das schneller ist. You cannot say weil dass; after weil you need a clause with its own subject, so weil das … is correct.

Im = in dem (a contraction). It requires the dative case. Alltag means “everyday life/day-to-day life.” So im Alltag = “in everyday life” or “for day-to-day purposes.” Grammar notes:

• Alltag is masculine: nominative der Alltag, dative dem Alltag → contraction im Alltag.

German normally needs an article with countable nouns.

• die Überweisung = a specific transfer (the one I’m doing now).
• eine Überweisung = an unspecified/single transfer. You can’t generally drop the article the way English sometimes does. For a habitual, generic statement, you’d rephrase:
• Überweisungen mache ich online.
• Or use the verb: Ich überweise online.

Both are common. The light-verb phrase eine/ die Überweisung machen is everyday German. The simple verb überweisen is more concise and equally idiomatic:

• Ich überweise online, weil das im Alltag schneller ist.

Two main meanings:

• Banking: a bank transfer (the meaning here, especially with online).
• Medicine: a referral slip from a doctor to a specialist.

Accusative singular as the direct object of machen. It looks the same as nominative because it’s feminine:

• Nom./Acc. fem. singular article: die.

As an adverb, online is lower-case and typically comes toward the end of the main clause, after the object:

• Default: Ich mache die Überweisung online. Fronting online is possible for emphasis: Online mache ich die Überweisung, but that sounds marked.

German often uses a bare comparative when the comparison is obvious from context. Here it implies “faster than doing it the usual offline way (e.g., at the branch).” You can make it explicit:

• …, weil das im Alltag schneller ist als zur Bank zu gehen.

Yes. Gehen with a comparative is very idiomatic for processes: “it goes/works faster.”

• Ich mache die Überweisung online, weil das im Alltag schneller geht.

Yes:

• Weil das im Alltag schneller ist, mache ich die Überweisung online. After the comma, the main clause resumes normal verb-second order (mache in second position).

You can use the adverb alltags (“in everyday life/usually”):

• Alltags mache ich Überweisungen online. Register: im Alltag is the most neutral and common; alltags is fine, slightly more written or stylistic.

A few idiomatic variants:

• Ich überweise online, denn das ist im Alltag schneller.
• Ich mache Überweisungen online, weil das im Alltag schneller geht.
• More formal/business-like: Ich führe Überweisungen online durch, … (sounds bureaucratic; avoid in casual speech).