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01 · 方法Hiragana vs KatakanaUsage, shapes and learning order.阅读 →02 · 方法Spaced Repetition and the Forgetting Curve1/3/7/14/30/60/120-day intervals and daily planning.阅读 →03 · 方法On Readings vs Kun ReadingsWhere the two reading systems come from and when they appear.阅读 →04 · 方法An N5 Kanji Study OrderFrom numbers and nature to people, school and transport.阅读 →05 · 方法How to Study N4 KanjiBy theme, with vocabulary, and by distinguishing similar characters.阅读 →06 · 方法From N5 to N4Kana, N5 kanji, N4 kanji, vocabulary and grammar.阅读 →07 · 方法A Plan for N4 VocabularyThemes, collocations, examples and output.阅读 →08 · 方法The Full N4 PathKana, N5, N4 kanji, N4 vocabulary, grammar and reading.阅读 →09 · 方法How to Study N4 GrammarConnections, examples, contrasts and output.阅读 →10 · 方法Where N4 Grammar FitsThe order of kana, kanji, vocabulary, grammar and reading.阅读 →11 · 方法An IELTS Vocabulary Plan That SticksHigh-frequency words, examples, spaced review and output practice.阅读 →12 · 方法Using Academic Words in WritingCollocations, word forms, examples and avoiding word salad.阅读 →13 · 方法Spanish Pronunciation BasicsFive vowels, stress, ñ and common consonants.阅读 →14 · 方法A 60-Word Spanish PlanTen words a day, examples, review and output.阅读 →15 · 方法What to Learn First in PythonVariables, containers, control flow, functions and modules in order.阅读 →16 · 方法Common Python TrapsMutable defaults, shallow copies, integer division, is vs ==.阅读 →17 · 方法Daily Git WorkflowThe status, diff, add, commit, pull and push loop.阅读 →18 · 方法Undo and Recover in GitChoosing between restore, reset, revert and reflog.阅读 →19 · 方法Excel Formula BasicsReferences, absolute/relative, errors and IF.阅读 →20 · 方法VLOOKUP, XLOOKUP and INDEX+MATCHWhen to use each lookup and common errors.阅读 →21 · 方法The Word/PPT Shortcuts Worth LearningSave, undo, formatting, slideshow and alignment.阅读 →22 · 方法A Keyboard-First Presentation WorkflowFrom new file and layout to slideshow, using keys.阅读 →23 · 方法Mental Math StrategiesRounding, splitting, times tables and exact division shortcuts.阅读 →24 · 方法Times Tables That StickFrom 2/5/10 to 7/8/9, practiced on a forgetting curve.阅读 →25 · 数据SQL SELECT Basics: WHERE, ORDER, LIMITThe minimal query structure for filtering, sorting and limiting rows.阅读 →26 · 数据SQL JOIN and GROUP BYJoining two tables, aggregate groups and HAVING.阅读 →27 · 方法How to Read Python OutputExpressions, repr, operator precedence and common traps.阅读 →28 · 方法List and Dict Output: Slices, Comprehensions, getSlice bounds, list comprehensions, dict keys and get defaults.阅读 →29 · 方法How to Read JavaScript OutputOperators, coercion, truthiness and JSON formatting.阅读 →30 · 方法Reading map, filter and reduceWhat array methods return, callback arguments and chaining.阅读 →31 · 方法Regex Basics: Classes, Quantifiers, Anchors\d, \w, +, *, ?, ^, $ and escaping.阅读 →32 · 方法Groups, Greediness and Lookaround(), (?:), greedy/non-greedy and (?=)/(?<=).阅读 →33 · 方法Tenses and Subject-Verb AgreementPresent/past, perfect tenses and third-person singular.阅读 →34 · 方法Articles, Prepositions and Passive Voicea/an/the, collocations and was/were + past participle.阅读 →35 · 方法Learning English, French and Spanish TogetherMain language, maintenance language and cognate strategy.阅读 →36 · 方法Cognates and False FriendsSimilar-looking words in English, French and Spanish: when to guess and when not to.阅读 →37 · 方法How to Read the Periodic TablePeriods, groups, atomic number and atomic mass.阅读 →38 · 方法Ions and IsotopesCharges, electron gain/loss and neutron counting.阅读 →39 · 方法Remembering Countries and CapitalsGroup by region, locate on a map and learn English names.阅读 →40 · 方法Regions, Currencies and ISO CodesRegions, three-letter currency codes and two-letter country codes.阅读 →41 · 方法Physics Formulas and UnitsFormulas and units for speed, density, force, work, power and pressure.阅读 →42 · 方法Ohm's Law and Electric PowerU=IR, P=UI, series/parallel and units.阅读 →43 · 方法Area and Perimeter FormulasRectangles, squares, triangles, circles and trapezoids.阅读 →44 · 方法Volume and Surface Area FormulasCuboids, cylinders, spheres and cones.阅读 →45 · 方法Spanish Regular Verb Endings-ar/-er/-ir endings across five tenses.阅读 →46 · 方法Using Five Spanish TensesWhen to use present, preterite, imperfect, future and conditional.阅读 →47 · 方法French Regular Verb Endings-er/-ir/-re endings in present, imperfect, future and conditional.阅读 →48 · 方法Using Five French TensesPresent, imperfect, future, conditional and passé composé.阅读 →49 · 方法Solving Linear EquationsTransposition, like terms, brackets and checking.阅读 →50 · 方法Quadratics and SystemsFactoring, two roots and elimination.阅读 →51 · 方法Italian Regular Verb Endings-are/-ere/-ire endings in present, imperfect, future and conditional.阅读 →52 · 方法Using Four Italian TensesWhen to use present, imperfect, future and conditional.阅读 →53 · 方法Country Codes and Calling CodesISO alpha-2/alpha-3, ccTLDs and dialing codes.阅读 →54 · 方法Timezones and Border CountsTimezone counts, land borders and island countries.阅读 →55 · 方法Mean, Median and ModeCalculating and choosing the three measures of center.阅读 →56 · 方法Variance and Standard DeviationPopulation variance, sample variance and standard deviation.阅读 →57 · 方法Simple and Compound InterestThe difference between I=Prt and A=P(1+r)^t.阅读 →58 · 方法ROI, Gross Margin and Break-EvenDenominators and meanings of three common business metrics.阅读 →59 · 方法Classical Probability and UrnsFavorable over total outcomes, with and without replacement.阅读 →60 · 方法Coins, Dice and CardsBinomial coins, 36 dice outcomes and 52 cards.阅读 →61 · 方法VLOOKUP and INDEX/MATCHLookup column, return column and exact match.阅读 →62 · 方法Text, Date and Logic FunctionsLEFT/MID/TRIM, YEAR/MONTH/DAY and IF/AND/OR.阅读 →63 · 方法Adding and Subtracting FractionsCommon denominators, numerator operations and reduction.阅读 →64 · 方法Multiplying and Dividing FractionsMultiply numerators, divide by multiplying the reciprocal and reduce.阅读 →65 · 方法Simplifying and Solving RatiosGCD, cross multiplication and the basic property of proportions.阅读 →66 · 方法Direct, Inverse and Proportional Sharingy=kx, xy=k and sharing by parts.阅读 →67 · 数据SQL JOIN Types and UsageINNER/LEFT JOIN, join conditions and aggregation.阅读 →68 · 方法Subqueries, EXISTS and Window FunctionsIN/EXISTS, correlated subqueries and ROW_NUMBER.阅读 →69 · 方法Question Tags and ConditionalsPositive/negative tags, three conditional types and tense pairing.阅读 →70 · 方法Passive, Relative Clauses, Gerund/InfinitiveBe + past participle, relative pronoun choice and verb patterns.阅读 →71 · 方法Derivative RulesPower rule, constants, sums/differences and second derivatives.阅读 →72 · 方法Definite Integrals and LimitsAntiderivatives, bounds and canceling for limits.阅读 →73 · 方法Liquidity and Solvency RatiosShort-term liquidity and long-term leverage denominators.阅读 →74 · 方法Profitability and Turnover RatiosDenominators for profitability and asset efficiency.阅读 →75 · 方法Debit and Credit BasicsIncrease/decrease directions for assets, expenses, liabilities, revenue and equity.阅读 →76 · 方法Common Accounting EntriesPurchases, sales, loans, payroll, depreciation and investment.阅读 →77 · 方法Counting Protons, Neutrons and ElectronsAtomic number, mass number, electrons and isotopes.阅读 →78 · 方法Ions and Isotopes in Atomic StructureCharge, electron counts and isotope notation.阅读 →