I've just started learning french, any tips?
Try and do something every day. If that is not enough - use flashcards. For French learn the gender with the noun eg memorize "un homme".
Make sure you read the tips before each skill - and sentence discussions after the lesson. Take notes. And use the hover method (do not take each skill to level 5 quickly) - https://blog.duolingo.com/whats-the-best-way-to-learn-with-duolingo/ (this gives you the best chance to remember long term and to understand the material)
Plus all the usual things for studying. Eat well. Sleep well. Take mini-breaks every 10-15 minutes and long breaks every 90 minutes or so.
(And use Search and read Stickies)
Start working on reading French right away, as well as developing your ear for listening. Start off with French readers and audio books for beginners. I spend about 70% of my French study, just listening to authentic French content. That boosted my French level immensely. Also, reading is wonderful for acquiring vocabulary and grammar structures in a holistic way. It helps you get a feel for what sounds right, rather than trying to remember grammar rules.
If you cannot understand at least 80-90% - find something easier. You cannot magically start to understand - and if you are guessing from context you can go very wrong. Lots of explicit vocab building is needed before any real native media.
However, listening without trying to understand is also useful to get your ear in.
The enable French audio for the rest of challenges (L1 EN -> L2 FR translations, fill the word into the blank, multiple-choice, alternative answers) you need Camilo's userscript for the web:
"Duolingo Tree Enhancer": https://forum.duolingo.com/comment/19654789/Userscript-Tree-Enhancer