Lost Invade, 13x13 Beginner(22kyu) Review Request

I know i made 10,000 mistakes like all beginners, however I thought I had a pretty good start but his invade was more successful than I would have hoped. If anyone could point out my biggest mistakes or what you think I generally could improve on most I would highly appreciate!

here you are far ahead because that white group is possible to kill
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you need to save your own stones first by connecting them with your alive group
it also will reduce space where opponent could create 2 eyes
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but instead you do useless cut on bamboo shape
https://senseis.xmp.net/?BambooJoint
never cut bamboo
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you still could stop plan of opponent like that

but…

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bad move: do not attack group of opponent before defending your own
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defend first, attack second
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Thank you. Very helpful!