Information Technology
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OSHistory.007 explains Bretton Woods: the dollar-gold system, IMF and World Bank, fixed exchange rates, the Triffin dilemma, the 1971 Nixon Shock, and the move toward floating currencies.
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OSFEC.007 teaches I²C bus engineering: addressing, open-drain signaling, pull-up resistor sizing, clock stretching, repeated START, bus recovery, and firmware diagnostics.
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Copy-on-write lets Linux processes share physical memory after fork() until one process changes a page. Learn how page tables, page faults, private mappings, RSS/PSS, and snapshots fit together.
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Memory-mapped files let Linux map file-backed data into a process’s virtual address space. Learn how mmap, page faults, page cache, MAP_SHARED, MAP_PRIVATE, and large-file I/O fit together.
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OSFTC.007 teaches safe SPI NOR flash diagnostics: identify the device, confirm voltage, read identification data, save repeatable backups, inspect protection, and verify authorized service work.
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OSFOEC.007 explains fiber nonlinearities in optical networks: Kerr effect, SPM, XPM, FWM, SBS, SRS, aggregate WDM power, effective area, and launch-power optimization.
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Learn coherent optical transmission engineering from the ground up: I/Q modulation, QPSK and QAM, dual polarization, coherent receivers, DSP, OSNR, FEC, and the capacity-versus-reach tradeoff.
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OSFOTC.007 teaches fiber cable installation and routing: bend radius, pulling tension, conduit and tray handling, figure-eight staging, slack, strain relief, labeling, inspection, and acceptance testing.
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OSDCEC.008 covers data center water systems: closed and open cooling loops, cooling towers, makeup water, blowdown, cycles of concentration, water quality, WUE, leak risk, and dry-cooling tradeoffs.
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OSSQL.002 teaches the SQL SELECT statement: result sets, select lists, choosing columns, SELECT *, FROM, expressions, duplicate values, row-order assumptions, and basic query reading.
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Learn a practical data-center server provisioning workflow: identity checks, BIOS/UEFI, storage and RAID, PXE or installation media, operating-system deployment, firmware and drivers, validation, documentation, and handoff.
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OSPHP.002 teaches PHP syntax fundamentals: PHP tags, statements, semicolons, echo, comments, whitespace, case sensitivity, short echo syntax, mixing PHP with HTML, and basic parse-error troubleshooting.
