If you are from EU/EEA, Switzerland, or belong to one of the countries on this list, you don’t need to apply for a Student Visa.

There are 3 kinds of student visas that will let you study full-time in New Zealand-

Fee paying student visa Pathway student visa Dependent child student visa

Read more about each of them in detail here

Follow these steps to complete the process for your New Zealand student visa application-

Collect your documents
Choose how you want to apply
Apply
Submit your application
Pay the New Zealand visa fees (around $57)
Wait for a decision
Get your visa

Read about each step in detail here

Your student visa will be valid for the same length of time as the study you’ve paid for.
This means that, if you want to stay back, you will need to land a job before you graduate and get a post-study work visa before your student visa expires.

If you’re planning to live in New Zealand after graduation, it’s best to get a job in an occupation where there’s a shortage of skilled workers.
You will find a list of Essential Skills in Demand on the New Zealand government website.
Doing this will definitely improve your chances of getting a residence visa later.

Yes, you'll need a student visa

Because students who don't need a visa for NZ have to satisfy one of the following categories-

You are a citizen of New Zealand or Australia If you are a resident of New Zealand You have a permanent visa for Australia

It takes between 4 to 6 weeks for a New Zealand student visa to be processed.
But you can always check the progress of your visa application online.

When you are admitted, the university sends you a student visa along with the acceptance letter itself.

Once you get this, apply for a Student Pass. To apply, head to the Student’s Pass Online Application and Registration System (SOLAR) website. Once you have logged in using the details provided to you by the university, fill in and submit the e-Form 16 and pay 30 SGD. After this, you will be provided with a disembarkation/embarkation card, which will get you entry into Singapore. You will have to complete the rest of the process after you have arrived in the country.

If you’re planning to study in Denmark for more than 3 months (90 days, to be precise), you will need a visa.
In case you’re from EU/EEA, you will have to apply for a registration certificate.
If you’re a Swiss citizen, you will be needing a residence card.
Otherwise, you will need a residence permit.

For a residence permit, you will need-

An acceptance letter from your university Financial proof that you can support yourself Language proficiency in English, German, Danish, Swedish, or Norwegian Passport Photographs
It will take at least 30 days to process your application. So, it’s best to apply for your residence permit 3 months in advance.

If the summer program to study in Denmark is for more than 3 months (90 days, to be precise), you will need a visa.

Biden has called for an increased number of visas for permanent, employment-based immigration
But until he actually does something, it's all speculation
It's best to be cautiously optimistic about this

The cost is AUD 620 + AUD 460 (if 18 and above) or + AUD 150 (if under 18)

Also-

Your academic transcripts Degree certificate, and A letter of statement from the university that has admitted you

No, you will not need to provide this if-
You’re from an English-speaking country or
Have completed a qualification equivalent to a UK degree in an English-speaking country

Most probably, if you have a degree from an Australian university you will be eligible for a post-study work visa.
For that...
What I would recommend is for you to start creating a strategy to achieve your goals

Research your industry in Australia.
Research what companies are looking for in an ideal candidate. And then start gaining experience in the Australian market as soon as possible.
Internships and part-time jobs in your industry are an excellent idea.

If you’re studying in Australia for up to 4 months, you could get a Working Holiday Visa.

There are three different Australian student visa types-

Student Visa (Subclass 500) – This visa will allow you to take up a full-time course in Australia and live there for up to 5 years Student Guardian Visa (Subclass 590) – If you wish to support a student who is under 18, you will need to apply for this visa Training Visa (Subclass 407) – Allowing you to do workplace-based training, this visa will allow you to participate in a classroom-based professional development training program and stay in Australia for up to 2 years

29 to 42 days for students who want to pursue higher education in Australia

The list of Ireland visa application requirements includes –

A letter of acceptance from a recognized school, college, or university. Evidence of your academic and English language ability Confirmation that course fees have been paid in full Proof that you have sufficient funds (usually €7,000) to support yourself during your stay Evidence that you or a sponsor have access to at least €7,000 for each subsequent year of your studies Verification of private medical insurance or EHIC possession An explanation of any gaps in your educational history Evidence of academic ability to pursue your chosen course Confirmation of your intent to return to your home country after leaving Ireland Two recent passport-sized photographs A passport that is valid for at least six months after the course will end

Learn about the entire visa process here