• Basic forms
• 込む — be crowded; go into / base form
• 込みます — is crowded; goes into / masu form
• 込んだ — became crowded; went in / ta form
• 込んで — being crowded … / te form
• 込まない — is not crowded; does not go in / negative
• 込めば — if it gets crowded / conditional
• Common expressions
• 道が込む — the road is crowded
• 電車が込む — the train is packed
• 人で店が込む — the shop is crowded with people
• More
• 込んでいる — is crowded / state

込む（こむ） is a godan intransitive verb. It describes becoming crowded, or going deep into something. It is also widely used as a suffix verb in compound verbs.

• Basic forms
• 込める — put into; load; include / base form
• 込めます — puts into; loads / masu form
• 込めた — put into; loaded / ta form
• 込めて — putting into … / te form
• 込めない — do not put in / negative
• 込めれば — if (you) put into / conditional
• Common expressions
• 気持ちを込める — put one’s feelings into
• 力を込める — put strength into
• 思いを込めて — with heartfelt feelings
• More
• 込めている — has put into / state

込める（こめる） is an ichidan transitive verb. It means to put something inside (physically or emotionally), and is common in fixed expressions like 気持ちを込める.