
die Seite
page
One of the two surfaces of a flat object, especially a sheet of paper in a book, newspaper, or magazine.
Schlagen Sie bitte die Seite 42 im Buch auf.
Please open the book to page 42.
page / side
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page
One of the two surfaces of a flat object, especially a sheet of paper in a book, newspaper, or magazine.
Schlagen Sie bitte die Seite 42 im Buch auf.
Please open the book to page 42.

side
An area located to the left or right of a center, a person, or an object.
In Deutschland fährt man auf der rechten Seite der Straße.
In Germany, people drive on the right side of the road.

website / page
A web page on the internet; a document that can be accessed through a web browser.
Ich habe die Informationen auf der offiziellen Seite des Unternehmens gefunden.
I found the information on the company's official website.

side
One of several parties or groups in a conflict, debate, or competition.
Auf wessen Seite stehst du in diesem Streit?
Whose side are you on in this argument?

side / aspect
A particular aspect or quality of a person, thing, or situation.
Er hat auch eine sehr sensible Seite, die er nicht oft zeigt.
He also has a very sensitive side that he doesn't often show.

to stand by someone
A fixed expression meaning to support someone or stand by them, especially in a difficult situation.
In schweren Zeiten haben mir meine Freunde immer zur Seite gestanden.
In difficult times, my friends always stood by me.
The preposition changes depending on whether a position (Wo? — where?) or a direction (Wohin? — to where?) is being described. You are 'auf einer Seite' (on one side; dative), but you go 'zur Seite' (to the side) or put something 'auf die Seite' (to the side; accusative).
Die Toiletten finden Sie auf der rechten Seite.
You will find the restrooms on the right side.
To distinguish the many meanings, pay attention to the context. Numbers and the word 'Buch' (book) point to a book page, 'Internet' to a web page, and 'Streit' (argument) to a party in a conflict.
Schlagen Sie bitte Seite 25 auf.
Please open to page 25.
The fixed expression 'jemandem zur Seite stehen' means to support a person. The person receiving the support is always in the dative.
In dieser schweren Zeit stand ihm seine Familie fest zur Seite.
During this difficult time, his family stood firmly by him.
In connection with books or documents, 'Seite' (page) is often used with the verbs 'aufschlagen' (to open), 'umblättern' (to turn the page), or 'lesen' (to read).
Er blätterte eine Seite um und las weiter.
He turned a page and kept reading.
When a web page is meant, typical verbs are 'besuchen' (to visit), 'aufrufen' (to open/access), or 'finden' (to find). The preposition 'auf' (on) is often used.
Auf dieser Seite können Sie sich für den Newsletter anmelden.
On this page, you can sign up for the newsletter.
To describe an aspect of someone's personality, 'Seite' (side) is often combined with a possessive pronoun and an adjective. Typical examples are 'seine lustige Seite' (his funny side) or 'ihre ernste Seite' (her serious side).
Er hat eine sehr ehrgeizige Seite, die nicht jeder kennt.
He has a very ambitious side that not everyone knows about.
party / party to
Both Seite and Partei can refer to a group in a conflict or dispute. Seite mainly names the position within the opposition, while Partei places greater emphasis on the clearly defined participant, especially in a legal dispute. Use Seite for a general position and Partei for a specific participant.

Im Streit um die Miete stellte sich die Nachbarin auf die Seite der Mieter.
In the dispute over the rent, the neighbor took the tenants’ side.
Im Rechtsstreit erklärte die Partei der Mieter ihre Forderungen.
In the legal dispute, the tenants’ party stated its demands.