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The source
שְׁבוּ אִישׁ תַּחְתָּיו אַל יֵצֵא אִישׁ מִמְּקֹמוֹ בַּיּוֹם הַשְּׁבִיעִי
Chazal derived techum Shabbat from this. Most Rishonim hold 2,000 amot is rabbinic (Rambam: 12 mil is Torah-level).
Beyond carrying, there is a walking limit: 2,000 amot outside the city. Learn the source, the measurement and eruv techumin.
שְׁבוּ אִישׁ תַּחְתָּיו אַל יֵצֵא אִישׁ מִמְּקֹמוֹ בַּיּוֹם הַשְּׁבִיעִי
Chazal derived techum Shabbat from this. Most Rishonim hold 2,000 amot is rabbinic (Rambam: 12 mil is Torah-level).
One who places food for two meals at a spot before Shabbat establishes it as his "place of rest" and may walk 2,000 amot from it (Eruvin ch. 3). It is effective only for a mitzvah purpose.
A study framework only - for a practical question, ask a rabbi.
Check on a map: where does your city end?
Shabbat also anchors place - "let each stay where he is".
Test yourself before marking the lesson complete.
What is the techum limit?