-(으)려고

Links an intention to the action taken to achieve it: 'in order to, so as to'. Neutral, everyday register.

목적·의도Purpose, plans & wishes

Han: -(으)려고 cannot be followed by a suggestion or command; with 가다 use -(으)러.

Examples

아침 일찍 일어나려고 알람을 두 개 맞췄어요.I set two alarms so I'd get up early.

한국 친구를 사귀려고 한국어를 배워요.I'm learning Korean to make Korean friends.

여행을 가려고 돈을 모으고 있어요.I'm saving money to go on a trip.

-(으)려고vs-(으)러-(으)러 must be followed by a movement verb but allows commands and suggestions: 밥 먹으러 갑시다; -(으)려고 works with any verb: 일찍 일어나려고 알람을 맞췄어요.

V (vowel or ㄹ stem)+려고

V (consonant stem)+으려고

사다 → 사려고; 먹다 → 먹으려고; 만들다 → 만들려고; 듣다 → 들으려고

Both clauses share the same subject, and the verb before -(으)려고 is an action verb, not an adjective.
The main clause cannot be a command or suggestion: not 사려고 갑시다; use -(으)러 or -기 위해(서) there.
Tense goes only on the main verb: 먹으려고 샀어요, not 먹었으려고.
Any main verb is possible (모으다, 일어나다, 연습하다), unlike -(으)러, which needs a movement verb such as 가다/오다.

Wrong: ~~책을 사려고 서점에 같이 갑시다.~~

Right: 책을 사러 서점에 같이 갑시다.

-(으)려고 cannot be followed by a suggestion or command; with 가다 use -(으)러.

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