• Basic forms
• 収める — put in; store; settle / base form
• 収めます — puts in; settles / masu form
• 収めた — put in; settled / ta form
• 収めて — putting in … / te form
• 収めない — do not put in / negative
• 収めれば — if (one) puts in / conditional
• Common expressions
• 税金を収める — pay taxes
• 箱に収める — put into a box
• 事態を収める — bring a situation under control
• More
• 収めたい — want to put in / 〜たい form
• 収めている — has put in; has settled / state

収める（おさめる） is an ichidan transitive verb. It means to intentionally place something inside, pay something due, or actively bring a situation under control.

• Basic forms
• 収まる — fit; settle; come under control / base form
• 収まります — fits; settles / masu form
• 収まった — fit; settled / ta form
• 収まって — settling … / te form
• 収まらない — do not fit; do not settle / negative
• 収まれば — if (it) settles / conditional
• Common expressions
• 箱に収まる — fit into a box
• 事態が収まる — the situation settles
• 怒りが収まる — anger subsides
• More
• 収まっている — has settled; is contained / state

収まる（おさまる） is a godan intransitive verb. It describes something fitting naturally or a situation calming down without direct control.