to arrive / concern
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to arrive
To arrive or reach a destination. It is a somewhat more formal or elevated variant of 'ankommen' (to arrive).
Sobald wir am Bahnhof anlangen, geben wir Bescheid.
As soon as we arrive at the station, we'll let you know.
'Anlangen' (to arrive / concern) is a separable verb. The prefix 'an-' comes at the end in a main clause. In subordinate clauses and in the infinitive, the verb stays together.
Der Zug langt pünktlich am Gleis 5 an.
The train arrives on time at platform 5.
In the meaning 'ankommen' (to arrive), 'anlangen' is mainly used in written language or in a formal, slightly elevated style.
Die Gäste werden gegen Mittag im Hotel anlangen.
The guests will arrive at the hotel around noon.
The expression 'was ... anlangt' (as for / concerning ...) is a fixed structure used to introduce a topic. The verb 'anlangt' always comes at the end of the introductory clause.
Was deine Frage anlangt, so kann ich sie noch nicht beantworten.
As for your question, I cannot answer it yet.
to reach
'erreichen' and 'anlangen' can both mean that you arrive at a destination. 'erreichen' is very normal in everyday language and often emphasizes the destination of a trip or route. 'anlangen' also means to arrive, but it sounds more formal or elevated and is used less often in everyday speech. Learners may confuse the words because both fit with travel and places. In normal conversations, 'erreichen' is usually more natural; 'anlangen' is more suited to elevated or written language.
Die Familie langt am späten Nachmittag im Hotel an.
The family arrives at the hotel in the late afternoon.
Wenn der Zug pünktlich ist, erreichen wir Berlin um acht Uhr.
If the train is on time, we will reach Berlin at eight o'clock.