The basic idea is simple: a state extends a temporary residence permit to overseas buyers who place a minimum sum in local alsancak real estate estate. The minimum investment is set very differently between countries, and the authorities change it regularly.
A crucial distinction separates residence and citizenship. The permit lets you live rental management in hurghada the country, typically subject to renewal, while citizenship generally takes a long period of residence. A promise of citizenship in exchange for an apartment purchase is a warning sign.
Beyond the purchase price, such permits come with additional requirements. Frequent requirements cover a clean criminal record, medical insurance, proof of income and a minimum number of days in the country per year. Ignoring one of these can end the status regardless of the property.
Tax residency is a separate question entirely. Having residency does not by itself make you taxable on worldwide income, and crossing the day-count threshold usually will. Most jurisdictions rely on a residence test based on days, and the effects touch earnings from abroad.
The realistic approach remains the same everywhere: buy something you would be happy to own, and let the permit be the second reason. Such schemes get restructured sometimes at short notice, and a property chosen only for a permit proves hard to rent and hard to resell.