übersteigen
to exceed
To go beyond a certain amount, measure, or value; to be larger or more than something else.
Die Kosten für das Projekt überstiegen das geplante Budget bei Weitem.
The costs for the project far exceeded the planned budget.

to exceed / climb over
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to exceed
To go beyond a certain amount, measure, or value; to be larger or more than something else.
Die Kosten für das Projekt überstiegen das geplante Budget bei Weitem.
The costs for the project far exceeded the planned budget.

'Übersteigen' (to exceed / climb over) is an inseparable verb. The prefix 'über-' remains firmly attached to the verb in all sentence forms and tenses and is not placed at the end of the sentence.
Die Nachfrage übersteigt bei Weitem das Angebot.
Demand far exceeds supply.
This verb always requires a direct object in the accusative. You ask: Whom or what does something exceed or climb over?
Die Reparaturkosten übersteigen den Wert des alten Autos.
The repair costs exceed the value of the old car.
In the abstract meaning 'mehr sein als' (to be more than), the verb is often combined with words such as 'Erwartungen' (expectations), 'Budget' (budget), 'Grenzen' (limits), or 'Kapazitäten' (capacities).
Deine Leistungen übersteigen alle unsere Erwartungen.
Your performance exceeds all our expectations.
When it refers to physical climbing, the object is always a concrete obstacle. Typical objects are 'einen Zaun' (a fence), 'eine Mauer' (a wall), or 'eine Absperrung' (a barrier).
Um in den Garten zu kommen, muss man die niedrige Mauer übersteigen.
To get into the garden, you have to climb over the low wall.
In the figurative meaning 'unverständlich sein' (to be incomprehensible), 'übersteigen' (to be beyond) is often used in fixed expressions. Common ones are 'jemandes Verstand übersteigen' (to be beyond someone's understanding), 'jemandes Vorstellungskraft übersteigen' (to be beyond someone's imagination), or 'jemandes Kräfte übersteigen' (to be beyond someone's strength/abilities).
Die Schönheit der Landschaft übersteigt jede Vorstellungskraft.
The beauty of the landscape is beyond all imagination.
to reach
'erreichen' and 'übersteigen' can both be used with numbers, limits, or results. 'erreichen' means that you get to a certain value or goal. 'übersteigen' means that something is higher or greater than a certain value. The risk of confusion comes from the fact that both words can be used with limits such as '100 Euro', 'das Budget' (the budget), or 'die Erwartungen' (the expectations). If something reaches exactly up to a limit, 'erreichen' fits. If it goes beyond that limit, 'übersteigen' fits.

Die Kosten übersteigen leider unser geplantes Budget.
Unfortunately, the costs exceed our planned budget.
Die Spenden haben am Abend die Summe von 1.000 Euro erreicht.
By the evening, the donations had reached the sum of 1,000 euros.