The phrase "to keep" means to maintain, preserve or retain something. It can be used in various contexts such as keeping a secret, keeping an appointment, keeping a promise, keeping a record, etc.
Usage examples
To keep a house clean, you should sweep and mop the floors regularly, dust the furniture, and clean the windows.
To keep a healthy lifestyle, it is important to exercise regularly, eat a balanced diet, and get enough sleep.
To keep your car in good condition, you should change the oil regularly, check the tire pressure, and wash it frequently.
To keep your computer safe from viruses, make sure you have updated antivirus software, avoid downloading unknown files, and be cautious while browsing the internet.
To keep a good relationship with your friends, it is important to communicate openly, show respect, and be supportive.
To keep your mental health in check, practice self-care activities like meditation or hobbies, avoid excessive stress, and seek help if needed.
To keep your personal information secure, use strong passwords, be cautious about sharing information online, and avoid clicking on suspicious links.
To keep plants healthy, water them regularly, give them enough sunlight, and remove any weeds or dead leaves.
To keep clothes in good condition, follow the care instructions on the label, store them properly, and avoid using harsh detergents.
To keep a positive attitude, focus on gratitude, surround yourself with positive people, and practice mindfulness or positive affirmations.
We need a bit of help keeping in mind that we are not, in fact, uniquely failing at this very hard thing. (romper.com)
If he didn't keep on buying the next target, then the fact that he was stripping all the assets out of companies he'd already bought would have become painfully obvious. (hbr.org)
Helps in keeping track of who is who on my contact listing. (biggerpockets.com)