A good thing to do when beginning to learn a new language is to immerse yourself in it. Given you're on /qa/ I'm guessing you've already watched ongezellig so you might already have a good base.
Go back and watch it with subtitles and switch between Dutch and English subtitles and pick out words, look them up for their meanings and say them out loud. Repeat common phrases.
Once you have a good base and know some of it, you can read some beginner books. These books should include specific language guides and children's books Both of them will help you pick up basic grammar and vocabulary.
Throughout the entire process, try to talk to some native speakers. Don't be afraid to make grammatical mistakes. Don't be afraid to mispronounce words. Don't be afraid to screw up, basically. You can learn a lot more vocabulary and phrases by hearing others speak them in a conversation than just by reading.
Some sources I have but it's not hard to find more:
https://www.gutenberg.org/ebooks/subject/2943 (for children's books, but the site also offers adult ones)
https://archive.org/details/beginnersdutch0000quis_u9h2/mode/2up (good guidebook to start out with, has phrases, goes into basic grammar, and a dictionary)
https://www.dutchpod101.com/blog/2021/03/18/dutch-grammar-overview/ (I use the pod101 sites specifically for grammar, but the entire site is alright)
That's all I got, good luck 'teen.