〜的
-ic, -ical; in terms of
Noun + 的 + な (adjective) / に (adverb)
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的 turns a noun, usually a Chinese-origin one, into a な-adjective: 経済 (economy) → 経済的な (economic, economical); 伝統 (tradition) → 伝統的な (traditional).
With に, it makes an adverb meaning "in terms of" or "-ally": 技術的に難しい, "technically difficult"; 個人的には, "personally speaking".
Some words only really live with 的: 積極的 (proactive), 具体的 (concrete), 基本的 (basic). And some nouns can't take it at all, so learn the combinations as you meet them.
In casual speech, young people stick 的 onto almost anything, including pronouns: 私的には, "for me". It's jokey slang, not textbook use.
Examples
経済的な理由で、大学をやめた。
I left university for financial reasons.
この問題は、技術的には難しくない。
Technically, this problem isn't difficult.
彼はとても積極的な人だ。
He's a very proactive person.
個人的には、この映画が好きです。
Personally, I like this film.
日本の伝統的な家に泊まった。
I stayed in a traditional Japanese house.