Welcome to the club, Jas One Gower!
In addition to the other answers:
The easiest way to understand Memrise is to see it as a automated flash card program.
Each course contains a long list of word or phrase, e.g.
French - English
je - I
Je suis. - I am
Je suis Jas. - I am Jas.
For easiness, a course is usually divided in “level”.
Users can make their own course, and Memrise makes also courses themselves.
For whatever reason, Memrise does not offer their courses as one course for one language, but as 7 courses for each language. I guess, that’s because they want to keep it ‘short and simple’. They 7 courses teach up to early intermediate vocabulary.
Memrise will only help learning part of the language: the memorization part of vocabulary and phrases. With the phrases, also some grammar is thought, but not extensively IMHO.
For speaking, you need something else.
For listening, Memrise allows to upload audio and can test with prompting the audio or the user selecting the right audio. But this does not yet teach the understanding, comprehension of a full text.
For reading, Memrise does not offer full texts. You need to get them somewhere else.
For writing/composing: Memrise does not offer anything, (except spelling when memorizing the words)
So basically: Memrise is best for vocab.
I have used Memrise to assist myself in learning to languages - just the vocab list of my course books. It was a life saver for me in memorization. It created a basis for the real learning in using the language, not every time having forgotten the right word.
Good luck! Hope it helps you as much as it did me and many others.