Hamsters and rabbits are popular pets, and each needs different basic needs to keep them healthy and happy. Here is a reference to the basic needs of each of them:

Basic needs of a hamster
Suitable cage:

The hamster needs a spacious cage with dense mesh to prevent escape.
A place for rest, play and climbing must be provided.

Proper nutrition:

The basic food includes grains, fresh fruits and vegetables.
Avoid dangerous foods such as chocolate, onions or garlic.
water:

Water should be available at all times, it is recommended to use filtered water.
A place to rest:

A soft and cozy nest, where the hamster can feel safe.
Entertainment media:

Running wheel, toys and other items that will provide employment for the hamster.
Comfortable environment:

Maintain a comfortable temperature and avoid exposure to summer heat or strong winds.

Basic needs of a rabbit
Cage or living space:

The rabbit needs a large space to move and exercise, with an open living space or a spacious cage.
A balanced diet:

The basic food includes hay (like timothy hay), fresh vegetables and grains.
Be careful about non-toxic foods and avoid beans, potatoes, etc.
water:

Water should always be available, with a bowl or water bottle.

Materials for nesting:

Soft and pleasant materials for the nest, such as tongue or straw, to provide comfort.
Entertainment media:

Toys, tunnels and other objects to explore and engage with.
Vaccinations and medical treatment:

It is important to take care of regular veterinary visits and vaccinations.
company:

Rabbits are social animals, so you should consider keeping more than one to keep them company.

Summary
Hamsters and rabbits require attention and investment to ensure their health and happiness. Be sure to provide them with these basic needs and of course, love them and spend quality time with them!